Here's what rhymes with affirmativity.
nativity activity captivity negativity conductivity relativity declivity festivity acclivity creativity selectivity insensitivity proclivity productivity radioactivity exclusivity superconductivity Words that almost rhyme with affirmativity
publicity rusticity simplicity elasticity toxicity complicity felicity specificity plasticity domesticity catholicity infelicity electricity eccentricity periodicity egocentricity ability agility dignity mobility affinity fertility nobility tyranny rapidity acidity bigotry volatility debility rickety trinity turbidity versatility cheerily bigamy billowy timothy privily possibility availability hostility utility validity vicinity antiquity divinity symmetry cheerfully feasibility morbidity rigidity viability vividly antipathy busily chivalry civility femininity minutely salinity simile solidity timidity distally ductility epitome fixity fragility litany prettily sociability sublimity timidly amiability docility senility villainy virility dismally tearfully wittily abysmally dizzily finicky willowy probability sympathy differently ministry capability officially infinity visually adaptability asymmetry futility symphony unanimity alkalinity fearfully fluidity indignity polygamy wilfully distantly epiphany fitfully reversibility ritually servility signally willfully affordability frigidity guiltily legibility malleability placidity aborigine fiscally scurrility stolidity responsibility flexibility initially conspiracy proximity reliability applicability humidity susceptibility tranquillity visibly acceptability brilliancy brilliantly compatibility facsimile irritability liquidity malignancy skillfully assiduously fearlessly irresponsibility magnanimity soliloquy wistfully admissibility blissfully calligraphy hospitably invalidity invisibility judicially unofficially viciously divisibility flippancy polyphony prolixity ambitiously auspiciously diffidently flippantly incapability negotiability efficiency sufficiently deficiency efficiently implicitly artificially contingency inherently masculinity sufficiency indifferently indignantly intermittently persistently religiously surreptitiously suspiciously beneficially deliciously exigency improbability inaccessibility inviolability listlessly stringency coherency contingently quizzically stringently consistently explicitly consistency delinquency insufficiency proficiency inefficiency superficially insufficiently predictably insistently invisibly practicability resiliency incoherently indivisibility inefficiently minstrelsy unpredictably inconsistency irresistibly expeditiously inexplicably inconsistently pusillanimity impracticability immunodeficiency