Here's what rhymes with improbative.
dative native iterative radiative denotative creative cooperative imitative integrative interpretative deliberative educative meditative dissipative procreative nonnative annotative legislative authoritative innovative qualitative collaborative appreciative associative evaluative oxidative vegetative dissociative evaporative connotative copulative cogitative emulative quantitative investigative manipulative regulative stimulative unappreciative rehabilitative administrative accumulative nonadministrative Words that almost rhyme with improbative
cages sages rages mutatis phages wadis wadges macrophages engages bellyaches reengages disengages greengages plaintive pervasive abrasive evasive invasive persuasive dissuasive unpersuasive nonabrasive noninvasive