Italian Etymology From fiduci(a) (“trust”, “confidence”) + -oso (“-ous”). Pronunciation IPA(key): /fi.duˈt͡ʃo.zo/ Rhymes: -ozo Hyphenation: fi‧du‧ció‧so Adjective fiducioso (feminine fiduciosa, masculine plural fiduciosi, feminine plural fiduciose) trusting confident Derived terms fiduciosamente Related terms fiduciafiduciantefiduciario Wikiwand - on Seamless Wikipedia browsing. On steroids.