Here's what rhymes with stiffness.
Words that almost rhyme with stiffness
business isthmus forgiveness bismuth agribusiness illness stillness bigness dimness witness thickness fitness sickness richness swiftness minutes spirits bishops impulse vicious digits influx tickets auspicious citrus fearless eyewitness pickets quickness seditious strictness billets discus ingots ingress pittance pivots sinless sinuous beardless bigots cirrus nimbus pickups villus witless distance appearance instance limits infants visits ambitious mistress suspicious delicious fictitious judicious pernicious bacillus biscuits brilliance viscous assiduous frigates grimace listless litmus papyrus rivets thickets trinkets avaricious cystitis factitious hillocks officious triplets unfitness hibiscus litigious mastitis riddance snippets wickets windlass windless wingless religious interests adherence clearance malicious prodigious admittance capricious hindrance pigments prestigious diffidence distinctness elicits nutritious propitious crickets indigence instants surreptitious profitless solicits assistance disappearance exhibits persistence subsistence adherents coherence inhibits shipments superstitious prohibits adventitious archbishops meniscus reappearance expeditious injudicious irreligious remittance repetitious resistless unambitious existence resistance interference assistants insistence perseverance delinquents contingents eucalyptus endearments unpropitious coefficients commitments reminiscence consistence incoherence infringements transmittance nonreligious coexistence enlistments nonexistence