Here's what rhymes with flupendous.
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agendas plenteous apprentice licentious momentous portentous filamentous haciendas tennis attendance census jealous menace pelvis penance tenets terrace deafness deathless pendants rottenness dependence precious careless preface tenants attendants fairness plexus rebellious reckless tariffs zealous breathless ferrous lettuce lieutenants necklace nexus pellets redness senseless chestnuts parrots pretentious barrenness debits friendless hairless headless trellis wellness wetness ascendance dependance fellas libellous pennants sententious parents presence awareness sentence merits peasants defendants descendants helpless restless vengeance repentance contentious dependents embarrass freshness impetuous crevice defenceless defenseless dentists dependants directness helmets selfless sheriffs legates zealots carats crevasse descendents ferrets pubescence ruggedness setups suppleness tendentious independence presents consensus develops segments amendments infectious correctness fluorescence remnants asbestos chemists forbearance semblance transcendence appellants unfairness breakfasts demerits pheasants unpretentious assessments resemblance adolescence conscientious marvellous remembrance impairments incestuous independents inherits luminescence prospectus superintendence vestments envelops erysipelas quiescence resentments senescence crescents efflorescence nonferrous overzealous propellants recrudescence unawareness acceptance adolescents interdependence acquiescence superintendents coalescence obsolescence refreshments effervescence entrenchments inflorescence intrenchments phosphorescence quintessence depressants godparents incorrectness investments contestants meaninglessness omnipresence incandescence manifestos convalescence disinfectants antidepressants