Here's what rhymes with siniply.
apply dry lie try ly ply rye lye pry tri trie wry lai luy pri by my high why die supply thy y buy cry fly guy imply 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 rely comply defy spy underlie decry pupae untie sty aquae retry amebae misapply stye turfy lanai ripply thereby nearby stimuli whereby hereby modify multiply nuclei signify simplify butterfly goodbye notify alibi nullify samurai terrify amoebae descry edify overlie oversupply resupply bonsai deify firefly triply ultrahigh blowfly overfly barfly mummify drachmai banzais yuppify justify occupy satisfy alkali verify certify purify alveoli amplify pacify ratify standby unify beautify lullaby termini typify codify dignify mollify mortify ramify vilify acidify mystify ossify vivify emulsify horrify petrify stupefy scurfy versify hyperbolae prettify shanghai vitrify overbuy syllabify clarify qualify specify classify testify glorify gratify fortify magnify rectify falsify solidify crucify liquefy personify electrify stratify stultify calcify reunify cumuli liquify scarify beatify gentrify refortify speechify dandify identify exemplify intensify quantify diversify indemnify objectify oversimplify demystify dragonfly preoccupy revivify dissatisfy declassify solemnify disqualify detoxify reclassify misidentify transmogrify