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