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