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