Originally Posted by ShadowDark
What you want is a thesaurus. It'll have an antonym section for each entry where you can find the correct prefix.
"If the total vocabulary of modern English is about 500,000 words, we can suppose that at least 100,000 of those are adjectives"
That'd be a lot of words i'd need to check for an antonym prefix.... that'd be A-intelligent.
I wonder if theres a better way!
"4. Dis-This Latin prefix, when attached to a word, implies one of several meanings: absence (disaffected) or lack (disabled), opposition (disapprove), or removal (disenfranchise)."
There's a few examples of antonym prefixes to cover most words in the english dictionary, if you stumble upon one that doesn't roll with a word, hyphenate or relax the expression to imply opposition to the statement (ie. disintelligent, dis-intelligent, That'd be a bad idea.)