Here's what rhymes with popularity.
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therapy parody fidelity melody hydrotherapy hypnotherapy chemotherapy psychotherapy radiotherapy physiotherapy readily legacy heresy brevity leprosy merrily warily wearily amenity acerbity retinae apparently carefully necessity density heavily primarily penalty seventy deputy allegedly heredity terribly serenity severally solemnity verily sesame revelry telemetry telepathy velvety legibly prayerfully identity chemistry destiny integrity presently specially steadily heavenly jealousy mentally ordinarily supremacy arbitrarily centrally chemically peasantry pleasantly specialty carelessly felony longevity pedigree perplexity tenancy clemency dreadfully immensity medically militarily recklessly weaponry heraldry inequity pedantry pleasantry professedly unbearably credibly nonentity tenantry testily blessedly devilry fretfully negligee temperately necessarily essentially intensity tendency complexity potentially pregnancy extremity secondly temporarily voluntarily hegemony transparency ascendancy customarily indemnity sensibly tremendously ascendency convexity dentistry jealously restlessly breathlessly flexibly lamentably regretfully transparently unpleasantly helpfully regrettably unsteadily vasectomy successfully accidentally discrepancy momentarily ostensibly helplessly incessantly incredibly biochemistry marvellously preferentially relentlessly secondarily sequentially splendidly acceptably confessedly mastectomy providentially biochemically geochemistry impeccably inclemency resentfully tangentially temperamentally tonsillectomy dependency fundamentally respectfully unnecessarily unsuccessfully contentedly developmentally insensibly clandestinely confidentially incrementally indelibly impetuously instrumentally respectably expectancy experimentally extraordinarily incidentally hysterectomy expectantly sentimentally unacceptably independently conscientiously environmentally contemptuously exponentially inexpressibly existentially incontestably indispensably quintessentially superintendency coincidentally