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