Synonyms for riddle Found 10 synonyms across 3 meanings for “riddle”. a difficult problem (noun) conundrumenigmabrain-teaser separate with a riddle, as grain from chaff (verb) screen spread or diffuse through (verb) permeatepervadepenetrateinterpenetratediffuseimbue Explore Related Words Rhymes with riddleSynonyms for conundrumSynonyms for enigmaSynonyms for brain-teaserSynonyms for screenSynonyms for permeate Synonym Finder | Rhyme Finder | Poetry Editor