Here's what rhymes with colourous.
glamourous Words that almost rhyme with colourous
lulus clueless hulas truelove scrofulous hallelujahs lupus units useless mucous mucus ruthless eunuchs humus newness rudeness aloofness hubris blueness congruous lewdness roofless rootless ulnas chukkas houmous houmus fruitless nuisance prudence coolness acuteness cubits shrewdness fluence toothless crudeness moonless bootless caduceus muteness cuteness humourless glumness cutups tuneups mutants pollutants smoothness tulips tumults astuteness avoirdupois truants annuitants canoeists juleps mullets gullets sublets spruceness manumits bouffants students movements amusements foodstuffs pursuance imprudence impudence absoluteness obtuseness diffuseness dissoluteness exiguous resoluteness coolants duellists intuits abstruseness profuseness hirsuteness persecutions quadruplets irresoluteness improvements jurisprudence inducements disputants translucence