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