Fastidious rhymes with:
hideous, insidious, invidious, claudius, commodious, hideous, insidious, invidious, melodious, odious, radius, studious, tedious, thaddeus
Fastidious sounds like:
facades, facet's, facetious, facets, factitious, facts, fajitas, fascists, fasts, faucets, faught's, faustus, feasts, fests, festus, fictitious, fight's, fights, fists, fixates, fojtik, fosdick, fossett's, foxwoods, fujitsu, fujitsu's, fustok