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