While trying to think of a brief list of English prefixes that mean "not" or "opposite to" in some way, I was wondering why so many exist. As English has roots in so many languages, I was hoping somebody could help me understand maybe how some prefixes hail from different languages, and why we have kept all of them. Perhaps there are micro-differences in meaning, and I'd love any insight on that. Examples of different prefixes all meaning the same thing, and examples, are below:

  • a- atypical
  • an- anaerobic
  • anti- anticlimactic, anti-clockwise (for Britons)
  • counter- counter-intuitive, counterclockwise
  • dis- disengage, disconnect
  • il- illegitimate
  • im- immeasurable
  • in- indestructible
  • ir- irresponsible
  • mis- misunderstand
  • non- nontraditional
  • un- unhappy

I know it's an antitypical question, but it's disunderstood in my head and seems misresponsible to have counterunderstood meanings to ameasurable words, making it unpossible for people to learn all these incommon prefixes.

  • 2
    Welcome to the site! Take a look at these related questions: Origins of negative prefixes like in-, un-, il-, ir-, dis-, a-, Are there any patterns to observe in choosing the correct negative prefix to use? I don't think your question is exactly the same as either of these, but maybe edit your question to make it more specific because another similar question has been marked as a "duplicate": I was wondering why there are multiple prefixes for the same meaning – herisson Aug 31 '17 at 23:48
  • Well, many of them come from Latin. With a- vs. an- I'm pretty sure the rule there is simply to prepend the former to words commencing with a consonant, and catenate the latter to the sinister side of words commencing with a vowel. – Parthian Shot Aug 31 '17 at 23:49
  • 2
    I tried to burn this question, but it turns out that it’s non-inflammable.   :-)   ⁠ – Scott Sep 1 '17 at 0:15
  • Thanks for the thoughts! Scott, thanks for bulleting the list. I realized it looked funny and was thinking about how best to reformat. Looks great. I'll try refining the question so it doesn't end up as a duplicate. Thanks. – C.Yi Sep 1 '17 at 1:42
  • You could question further. Why inability but unable ... – GEdgar Dec 26 '19 at 20:37

The negative prefixes usually have a rather complex developmental history, and there is usually some overlap into similarly negative meanings. The following nuances can thus be considered as general, rather than specific.

a- atypical / an- anaerobic: These are the same - compare a cat/an egg. A-/an- = without/ outside of / absent(prep.) Compare amoral = outside the category of “moral”; that cannot be characterized as either morally good or bad. "Amoral" is basically neutral, (although when applied to human activity and because humans are expected to be moral) it is chiefly negative, and immoral -> contrary to “morals”: this is basically negative.

anti- anticlimactic, anti-clockwise (for Britons): anti+ X = in opposition to X/as opposed to X

counter- counter-intuitive, counter clockwise: in the opposite direction or sense, with a contrary effect, or in opposition, or response. From the adverb counter c1446 in T. Wright Political Poems & Songs (1859) II. 224 Now ye han founde parfite, love welle your game; For and ye renne countre thenne be ye to blame. (Now that you have perfection, love well the object of your pursuit; for, if [you do not] you will be running counter, and then you will be to blame.) - Compare with contrary

de- des- di-, dif-, dir-, dis- disengage, disconnect – dis: to undo that which is already done or was the state/condition. ((i) disaster = dis + astra = against the stars -> ill-starred -> the undoing of [expected] fate. (ii) Differ - Latin: dif- prefix + ferre to bear, carry.)

il-, im-, in-, ir-, ig-. These are all the same. = not. These are all related to “un-“

mis- misunderstand – this is the same “mis”- as in mistake = mistakenly; in error - both with a nuance of "unintentionally".

non- non-traditional = outside the category of (very similar to a-/an-)

un- unhappy = not.


Here's what might be a piece of the puzzle. In the case of "i", it seems that words are modified to preserve pronunciation. This happens in Portuguese; for instance, "legítimo / ilegítimo", "responsável / irresponsável": we get a double R because otherwise the result would sound weird.

This might be the case with the negation of 'responsible' and 'aerobic'.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.