Words That Rhyme With "Frivolous" :
3 syllables:
bibulous, limulus, Nicholas, nickelous, Nicolas, sniveling, stimulus, swiveling
4 syllables:
acidulous, amphibolous, apiculus, calcicolous, caliculus, calyculus, caulicolous, corydalis, cuniculus, fasciculus, funiculus, hispidulous, limicolous, meticulous, muscicolous, nidicolous, pediculous, peribolos, peribolus, pratincolous, ridiculous, saxicolous, silvicolous, stagnicolous, terricolous, tubicolous
5 syllables:
arenicolous, deserticolous, erysipelas, foliicolous, nemoricolous, stercoricolous