I know the rule for making the comparative and superlative form for two-syllable words ending in y, replace the -y with i and use -er and -est:

hap.pyhappier(the) happiest
ti.dytidier(the) tidiest
fun.nyfunnier(the) funniest

Instead for two-syllable adjectives which do not end in -y, use more and most:

bor.ingmore boring
wor.riedmore worried
care.fulmore careful
tra.gicmore tragic

However, there are inexplicable exceptions: The Free Dictionary says the comparative and superlative form of clever is cleverer and cleverest. Yet to my ears

He's more clever than I thought

sounds more formal and correct.

Google produces a total of 15 pages for “he is more clever than” and 16 pages for the contracted form, “he's more clever than”. Similarly, Google yields 16 pages and 15 pages for “he's cleverer than” and “he is cleverer than” respectively, which suggests there is very little to choose between the two comparative forms.

Meanwhile, TFD insists that the comparative and superlative form of simple is simpler and simplest. Google seems to concur and produces 17 pages for “it is simpler” compared to only 9 pages for “it is more simple”.

The two-syllable adjectives that I am aware of, which have both kinds of comparative and superlative forms are:

  • clevercleverer/more clevercleverest/(the) most clever
  • commoncommoner/more commoncommonest/(the) most common
  • gentlegentler/more gentlegentlest/(the) most gentle
  • humblehumbler/more humble (etc.)
  • hollowhollower/more hollow
  • narrownarrower/more narrow
  • politepoliter/more polite
  • quietquieter/more quiet
  • simplesimpler/more simple
  • stupidstupider/more stupid
  • subtlesubtler/more subtle

Etymologically speaking, is there any explanation for this? Is it a recent trend? It seems to me that the number of two-syllable adjectives that add the suffix -er and -est are increasing.

And finally, is there a trick or rule which I can teach my advanced private students? With younger learners and beginners I teach the “rule” that I mentioned at the beginning—so much simpler! :)

EDIT December 11, 2019

I shall never ever understand Google's algorithms and how they produce their statistics. In the end, for the sake of clarity, the number of results have been substituted and updated with the number of pages each search produced.

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    Counting Google hits is a notoriously bad estimate for how common something is; Google Ngrams shows simpler is fifteen times more common than more simple. Putting the whole sentence in doesn't make much difference. Commented Jan 11, 2014 at 17:15
  • So your estimate of simpler being 1.5 times more common is way off. And Google Ngrams says cleverer is preferable. Commented Jan 11, 2014 at 17:23
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    Mari-Lou You're getting Englisher and Englisher every day!
    – bib
    Commented Jan 11, 2014 at 17:34
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    To justify my estimation of "nearly completely worthless", the phrase "simpler than" returns 1.58 million hits, and the phrase "is simpler than" returns 12.6 million hits. But every single hit for the second phrase should also be a hit for the first. If this doesn't show these results aren't very reliable, I don't know what does. However, I think your question is a very good one, and I don't know a good answer. Commented Jan 11, 2014 at 17:37
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    Mari-Lou: I think you can add humble to the list. Commented Jan 12, 2014 at 0:50

4 Answers 4


According to Swan in Pratical English Usage (p114) the two-syllable adjectives whose comparative form is most likely to be formed with -er are those that end with an unstressed vowel; e.g. narrow, simple, clever, subtle, etc. from your list above. Swan goes on to state:

With many two-syllable adjectives (e.g. polite, common) -er/-est and more/most are both possible. With others (including adjectives ending in -ing, -ed, -ful, and -less), only more/most is possible. In general, the structure with more/most is becoming more common. To find out the normal comparative and superlative for a particular two-syllable adjective, check in a good dictionary.

It is interesting that Swan himself uses more common and not commoner in his explanation above, and this seems the better choice in a formal written context. So if you are looking for guidelines for your advanced students I would recommend:

  • Learn the common two-syllable adjectives ending with an unstressed vowel that can be compared with -er.
  • For the rest use more. I suspect that native speakers are much more likely (likelier?) to consider an -er usage problematic than a more usage. For example, more polite or even more clever will probably sound less ungrammatical than pleasanter or tranquil(l)er.

If your students really would like to know word-by-word if the -er comparative is possible, they will need to consult a good dictionary. Swan recommends the Oxford Advanced Learner's Dictionary, the Cambridge Advanced Learner's Dictionary, the Longman Dictionary of Contemporary English, the MacMillan English Dictionary and the Collins Cobuild English Dictionary.

The Collins, for example, shows pleasanter but more tranquil as the comparative forms.


The rule that mono- and disyllabic adjectives form their comparatives with -er and larger adjectives do so with more is more or less consistently correct (unless they be participles); however, if you want a more detailed explanation, I have given one below:

There is no absolute rule, but the general trend is that any word that comes from Latin or French into English will form a comparative with more, whereas adjectives of Germanic origin tend to use -er. Past and present participles also use more to form comparatives.

Obvious Latin adjectives usually end in -ive or -ous, both of which form their comparatives with more. E.g. he is lecherous and he is more lecherous, but never he is lecherouser; he seems pensive and he seems more pensive, but never he seems pensiver.

The most notable exception to this is when a Latin comparative or superlative wriggles its way into English; such examples include major 'lit. greater (comparative of magnus 'great') and supreme 'lit. highest (superlative of superus 'high'). These, however, are still not formed regularly by English standards.

Another exception occasionally occurs when adjectives come through French or Vulgar Latin, such as certain, which has in the past formed its comparative as certainer, but this use is almost completely gone. More persistent comparatives of this category include nobler and gentler, largely because of the ease in reducing gentilis to gentle and so on.

French adjectives tend to end in -ant or -ent. Again, a man can be defiant or more defiant, but he cannot be defianter. These adjectives are past participles, and so this rule is also in line with the English rule.

Germanic adjectives, however, almost invariably form their comparatives with -er. Happier, sillier, darker, et cetera are all in this class.

Participles, whether they be Germanic or Latin, present or past, never use -er: he is more annoying, his beard was itching more, the sheep is more shorn, the passage was read more, and so on.

Basically, if it sounds Germanic and is not a participle, use -er; if it sounds Latin, use more.

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    But common, gentle, humble, quiet, simple, and stupid derive from latin, and they sound kinda Italian too (comune, gentile, umile, quiete, semplice, stupido) so why do they belong to the -er/-est list?
    – Mari-Lou A
    Commented Jan 12, 2014 at 2:48
  • Common belongs to the same class as certain, but it has retained the -er comparative; it also underwent a changes that made it sound more Germanic (the Latin word is communis). Gentle (gentilis) and humble (humilis) belong to the same class as noble (nobilis). Simple comes from Latin simplus, which is easy to turn into an -er comparative; unfortunately, I can find no better reasoning. For quiet I can also find no better reasoning. Stupid should not form an -er comparative, however, as similar words, such as vapid and placid, tend not to, but sometimes it does.
    – Anonym
    Commented Jan 12, 2014 at 3:22
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    I suspect that the origin of the word is largely a red herring (after all, native speakers intuit whether the -er structure is possible and don't intuitively have any idea about the original of the word). What is happening is that there is some overlap between e.g. the prosodic structure of a word and its origin, and so statistically, there is a chance that words with certain origins will follow a particular rule for comparative formation. But the word's historical origin can't be the reason for it following a particular pattern: the information isn't intuitively available to speakers. Commented Apr 25, 2014 at 14:58
  • @NeilCoffey Although most native speakers don't know the etymology, we learn how to use words from our parents, friends and teachers, so patterns and rules get passed on with slight mutations through the generations. Why is the h pronounced in hair but not in heir? Because centuries ago the coming Germanic folk pronounced the h and fewer centuries ago the arriving Normans didn't. Which verbs change tense by changing a vowel? The strong Old English (Germanic) ones: come/came vs arrive/arrived via French. The patterns are passed on through the generations. Word origins definitely play a part.
    – AndrewC
    Commented Jun 23, 2014 at 20:07
  • @Mari-LouA I'm from the UK, where commoner is a noun, not a comparative, and "stupider" sounds more stupid than "more stupid", and would be only used ironically. There are exceptions, but I think Anonym has hit on the most likely reason.
    – AndrewC
    Commented Jun 23, 2014 at 20:12

The Oxford English Dictionary provides its answer here.

I personally prefer the rule: For 2 syllables use -er/-est unless that form is not allowed (see OED).

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    Oxford Dictionaries Online (ODO) is not the Oxford English Dictionary (OED), which is subscription-only. This is a common error. Commented Jan 11, 2014 at 22:59

Okay so the simplest answer I can give is, the usage of more clever versus cleverer is relative to two things; third person versus first person, and if the term is referencing a person or thing.

For example: (From a narrative third person) Margie was more clever than Dick. (From a narrative first person) I was cleverer than Dick.

(From a narrative third person) "The engine was most clever" said Margie (From a narrative first person) "I say the cleverer engine best all the other inventions".

Cleverer however has fallen out of use in modern English, except in jibe and glib commentary. Idioms from the Mid-modern English era post-Shakespeare use cleverer quite often.

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    This is quite blatantly not true. There is no difference in person whatsoever; he is cleverer and I am more clever are equally valid, regardless of narrative perspective. Commented Jan 11, 2015 at 10:30
  • Actually, as a fiction writer and screenwriter, and as a linguist, I can tell you there is a huge difference in how we tend to write first person and third person narrative. You see this distinction all of the time by writers like Shakespeare, Chaucer, and Mark Twain. Just because you don't like this fact doesn't make it incorrect. Commented Jan 4, 2016 at 1:24
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    Please do feel free to back up your claim with evidence. As it stands, you are making a claim based on nothing at all, and one that goes against at the very least four people's use of the English language. I'm not saying there's no difference in how we write first- and third-person narratives; but as a linguist, I can tell you that comparative formations are not normally one of those differences. Commented Jan 4, 2016 at 5:38
  • I say this makes some limited sense and the observation is notable, but I don't think you could explain it, so it is not a sufficient answer.
    – vectory
    Commented Dec 14, 2019 at 1:11

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