Words That Rhyme With "Portentous" :
2 syllables:
cantus, centas, countess, deftness, dependance, frontis, intis, lettuce, mantis, penn'orth, pentose, Pontus, prentice, quintus, Santas, scentless, sentence, ventose, Ventress
3 syllables:
adeptness, agendas, apprentice, argentous, ascendance, ascendence, Atlantis, correctness, dependence, directness, discantus, elenchus, erectness, eventless, horrendous, Hymettus, impendence, ineptness, momentous, relentless, repentance, resplendence, sarmentose, sienna's, stupendous, tomentose, transcendence, tremendous, vendettas, Vienna's, Vincennes
4 syllables:
condescendence, excrementous, filamentous, incorrectness, independence, indirectness, ligamentous, operettas, Pocahontas