Here's what rhymes with legitimitizing.
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diving tithing dicing driving arriving deriving pricing writhing knifing striving surviving thriving enticing splicing slicing conniving depriving reviving contriving apprenticing sacrificing streptomycin dying buying dining timing abiding biting typing piling piping tying dyeing tiring pining biding biking chiding tiding writing trying binding fighting lying applying firing mining riding drying filing guiding hiding lighting lining shining admiring assigning citing hiring liking signing ageing aspiring obliging wiping wiring hiking plying priming prying rhyming siding sighing sighting spying undying untiring whining alighting aligning bribing righting siting styling twining vying blighting fining liming spiking whiting shying viking knighting maligning opining priding retyping seining wining finding striking underlying crying defining flying smiling acquiring climbing combining deciding denying designing dividing lightning sliding supplying winding inspiring refining retiring trifling blinding frying gliding undermining compiling conspiring defying stifling striding underwriting beguiling colliding delighting divining minding perspiring subsiding underlining griping hireling repining rifling slighting sniping unsmiling belying deriding indicting unedifying bandying providing exciting declining occupying grinding implying inviting modifying presiding relying residing terrifying uniting confining justifying overlying overriding reciting replying unifying ascribing complying confiding edifying expiring inciting inclining resigning rewriting disliking igniting notifying decrying expediting intertwining nullifying pacifying uninspiring uninviting unwinding enshrining exiling nonbinding ossifying overwriting personifying ramifying recombining typifying unexciting describing identifying multiplying reminding specifying reconciling signifying coinciding horrifying intensifying magnifying purifying reclining stereotyping subscribing testifying verifying amplifying certifying fancying mortifying prophesying ratifying redefining transcribing emulsifying inscribing mystifying redesigning reuniting stultifying stupefying subdividing acidifying codifying satisfying gratifying clarifying classifying prescribing qualifying simplifying diversifying fortifying glorifying rectifying sanctifying unsatisfying beautifying electrifying falsifying solidifying vivifying calcifying crucifying fructifying indemnifying liquefying proscribing putrefying vilifying exemplifying quantifying circumscribing disqualifying objectifying oversimplifying