Here's what rhymes with diversionary.
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belly allele jelly smelly deli telly vermicelli underbelly many messy heavy ready fairly rarely barely semi petty levy penny antennae heady levee medley unfairly jetty teddy bevy faery jenny kepi leggy recce sedgy veggie healthy steady wealthy deadly lengthy gentry unhealthy fleshy squarely carefree sentry sexy sketchy spaghetti sweaty unsteady vestry belfry deathly gayety halfpenny hefty machete sullenly confetti fidgety hostelry pebbly tempi testy breathy dressy pesky thready lefty wetly already especially twenty assembly scarcely elementary gently plenty freshly immensely densely frenzy deftly coquetry fleshly stealthy tensely trendy aplenty libretti maidenly marquetry adeptly effendi ineptly directly friendly correctly intensely epilepsy intently unfriendly apoplexy sacredly baronetcy preciously woodenly indirectly complementary expressly incorrectly excellency complexly narcolepsy catalepsy circumspectly deviancy reassembly confusedly grotesquely cognoscenti penitently equivalently ambivalently