Here's what rhymes with rigidius.
hideous insidious invidious fastidious Words that almost rhyme with rigidius
tibias amphibious bilious serious dizziness imperious giddiness chilliness ligneous pithiness tinniness mysterious initiates oblivious resilience vitreous weariness delirious pitiless lascivious silliness stickiness trickiness bitchiness tipsiness prissiness hilliness bleariness experience affiliates deleterious prettiness filthiness riskiness milkiness silkiness wittiness skinniness recipients ignominious lineaments punctilious supercilious flimsiness grittiness percipience incipience propitiates friskiness princeliness skimpiness inexperience miscreants conciliates disaffiliates consanguineous