Here's what rhymes with unneccssary.
very vary fairy ferry hairy sherry harry faerie marry merry bury dairy wary cherry berry scary tarry parry nary tare barre terry wherry necessary prairie remarry aviary pessary missionary unnecessary dictionary adversary maxillary visionary estuary honorary commissary emissary savagery ternary canary cautionary unwary breviary apiary cassowary equerry humeri sectary military literary secondary secretary customary capillary coronary dietary solitary stationary urinary cemetery sanitary ancillary corollary mercenary seminary fiduciary functionary funerary stationery statuary confectionery dignitary bacillary buffoonery legionary actuary bilberry elderberry topiary nondairy plagiary ordinary temporary monetary commentary hereditary monastery sanctuary subsidiary beneficiary judiciary legendary momentary pecuniary reactionary unitary budgetary dysentery salutary sedentary veterinary apothecary culinary itinerary mortuary obituary papillary sanguinary centenary luminary unsanitary beriberi diversionary concessionary huckleberry lapidary recessionary chokecherry uncustomary contemporary arbitrary pulmonary evolutionary imaginary pituitary tributary inflationary planetary exclusionary deflationary epistolary expansionary expeditionary tutelary insanitary nonmilitary undersecretary dromedary eleemosynary voluptuary elocutionary nonliterary tercentenary nonhereditary revolutionary vocabulary disciplinary fragmentary involuntary discretionary paramilitary probationary supernumerary geostationary bicentenary extraordinary preliminary proprietary genitourinary constabulary interplanetary interdisciplinary cardiopulmonary multidisciplinary counterrevolutionary Words that almost rhyme with unneccssary
belly jelly smelly deli telly allele vermicelli underbelly heavy fairly semi heady faery sedgy veggie many ready healthy rarely steady barely petty levy penny fleshy levee messy sentry sexy sketchy sweaty vestry hefty jetty teddy bevy jenny thready kepi leggy recce scarcely wealthy deadly lengthy freshly gentry frenzy squarely carefree medley unfairly belfry deathly fleshly gayety halfpenny machete stealthy confetti fidgety hostelry pebbly tempi testy breathy dressy pesky effendi lefty wetly already especially twenty assembly friendly gently plenty expressly unhealthy densely antennae deftly excellency spaghetti unsteady coquetry sullenly tensely trendy deviancy directly correctly immensely sacredly aplenty libretti maidenly marquetry reassembly adeptly ineptly preciously woodenly elementary intensely epilepsy intently unfriendly confusedly grotesquely catalepsy cognoscenti indirectly incorrectly apoplexy complexly narcolepsy ambivalently baronetcy complementary equivalently circumspectly penitently