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