Here's what rhymes with unhapply.
dry lie try ly ply rye lye pry tri trie wry lai luy pri by my high why apply die supply thy y buy cry fly guy tie vi hi shy sigh bi bye chi dye fi hy nigh pi pie thai thigh vie dei fry psi quae sly ty wir awry hai mai muy nai belie cy fy kai mei sy tai thei wai phi spry slier reply sky deny imply rely defy spy certify underlie samurai decry pupae sty retry misapply stye turfy lanai shanghai ripply thereby nearby occupy satisfy whereby comply hereby modify alkali butterfly goodbye alibi alveoli amplify ratify standby terrify untie descry edify overlie resupply aquae bonsai deify firefly ossify triply ultrahigh amebae blowfly stupefy overfly scurfy barfly hyperbolae vitrify drachmai banzais yuppify justify multiply nuclei simplify verify gratify notify purify fortify nullify pacify unify beautify lullaby termini typify amoebae codify mollify mortify oversupply ramify vilify acidify mystify stratify stultify vivify horrify petrify scarify versify mummify prettify beatify speechify overbuy dandify stimuli clarify qualify specify classify signify testify glorify quantify diversify magnify rectify falsify solidify crucify dignify liquefy personify calcify reunify dissatisfy liquify gentrify refortify syllabify identify exemplify objectify demystify dragonfly electrify preoccupy emulsify revivify cumuli declassify transmogrify intensify disqualify indemnify oversimplify detoxify reclassify misidentify solemnify