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I have read the rules for using im- versus un- and agree with the general ideas put forth. A word that I used recently, seems to fall into a category all its own. The word is (im)provable, meaning not provable. I Provable is an adjective, so is the opposite of provable (un)provable or (im)provable? If it is (im)provable, that violates another meaning of the word, ie: something that can be improved. Or should it be nonprovable?

closed as off-topic by Peter Shor , chasly from UK, tchrist, anongoodnurse, Mitch Oct 10 '15 at 13:58

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  • What are these rules - where did you read them? Are you saying that 'imprint' is the opposite of 'print'? Do you think 'imagine' is the opposite of 'agine'? What about 'impish'? – chasly from UK Oct 9 '15 at 20:15
  • imbecile, implode, impetuous etc. – chasly from UK Oct 9 '15 at 20:23
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    Different in-. The word improvable doesn't mean 'not capable of being proved', but rather 'capable of being improved'. SInce there's already a word improve with a different in- prefix, the negative in- prefix can't apply to provable. This is what un- is for. – John Lawler Oct 9 '15 at 21:24
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The opposite of provable is unprovable:

Unable to be demonstrated by evidence or argument as true or existing

http://www.oxforddictionaries.com/definition/english/unprovable

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