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Somewhat related to this question, I am curious to know what words in English would seem to be opposites at first blush but are in fact synonyms?

Immediately I can think of flammable and inflammable.

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I can't think of another example, but Wikipedia has a little paragraph on Flammable vs inflammable en.wikipedia.org/wiki/… –  nico Apr 3 '11 at 6:51
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+1 Interesting question, I'll be looking forward to more answers. –  Alenanno Apr 3 '11 at 8:54
    

5 Answers 5

up vote 7 down vote accepted
  • regardless and irregardless (although some don't consider irregardless a real word)
  • bone and debone
  • press and depress
  • caregiver and caretaker
  • ravel and unravel

some related examples in slang. These use the same word, but mean the opposite:

  • shit and the shit
  • bollocks and the bollocks, or the dog's bollocks
  • a bomb and the bomb
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I'll add "privation" and "deprivation" here. –  rumtscho Apr 29 '11 at 21:21
    
I'll add habitable and inhabitable here, too. –  fbrereto Mar 1 '13 at 20:09

Valuable and invaluable is the only example that comes to mind

http://grammarist.com/usage/invaluable-valuable/

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Though they are of different origin, I would go for 'genius' and 'ingenious', perhaps?

I also have some points to raise from previous answers:

Irregardless is most likely from a combination of 'irrespective' and 'regardless', which are synonyms of each other. Therefore 'irregardless' is seen as an erroneous construction by many, as Sam pointed out.

Also, 'ravel' and 'unravel' are not the same. The phrasal verb 'ravel out' is synonymous with 'unravel' but alone, 'ravel' means to complicate, while 'unravel' in that sense would mean 'make clear something that was complicated'.

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Ravel: To become untwisted or unwoven; to be disentangled; to be relieved of intricacy. I've seen it most in connection to fabrics they tend to ravel. I would also suggest that words are constantly coming into use by people misusing old words. Eventually, if enough people use it incorrectly, it becomes correct. Language is not a fixed thing. –  Sam Apr 3 '11 at 15:02
    
I'm not sure what dictionary you are using, Sam. Could you point me to it, please? As I understand, the word is of Germanic origin, 'ravelen' - to tangle. Interestingly, its meaning 'to disentangle' is seen in English earlier than 'to entangle' but still combined with the word 'out' –  Karl Apr 3 '11 at 15:12
    
Shakespeare: must I rauell out My weau'd-vp follyes (King Richard II - 1593) –  Karl Apr 3 '11 at 15:14
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http://www.merriam-webster.com/dictionary/ravel Ravel seems to be one of those special words that can mean opposite things, e.g. cleave and cleave. –  Sam Apr 3 '11 at 15:19
    
Thanks for that, Sam. I was hunting myself at the same time and came across several definitions, most of which linked back to Mirriam Webster. With that link in mind, it would appear I have to concede, though with the Caveat that M-W is an AmEng dictionary and I am British. I would hazard to say that this is one of those words on which we differ in usage (assuming you are American?). Nevertheless, it appears that 'ravel' can indeed mean both. Thanks again, Sam. –  Karl Apr 3 '11 at 15:24

The answer to this one might be "false friends." The term refers to cases where a word in a foreign language is deceptively similar to one in your native tongue and leads you thus astray. Here the case is a bit different but I could see extending the sense a bit.

Another example in the same class is the word "enervate," where the Latinate prefix (as with "in" in "inflammable") has a meaning that leads the unknowing speaker down the wrong path.

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False friends refers to when two words, each from a different language look the same or similar but mean different things, as you correctly said. But I don't think it's really related to the question, since calling "flammable" and "inflammable" false friends might be misleading, in my opinion. Correct me if I'm wrong... –  Alenanno Apr 3 '11 at 13:04

What is the term for this phenomenon? Another one I have heard suggested: Overtone/Undertone.

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