diffident adj. + Add to list UK //dˈɪfɪdənt// dif·fi·dent Archaic SynonymsAntonymsEtymology Synonyms shytimidunsure Antonyms confidentOriginLATdiffīdentem→ENdiffident From Latin diffīdentem, present participle of diffīdere (“to mistrust”). Doublet of defiant.