Here's what rhymes with mentionable.
pensionable unmentionable Words that almost rhyme with mentionable
eligible equitable negligible educable inevitable questionable objectionable reputable heritable impressionable inequitable revocable exceptionable penetrable intelligible creditable impenetrable unquestionable irrevocable unexceptionable inheritable unobjectionable predicable demonstrable pestilential unintelligible disreputable discreditable