sfumatoPronunciation: /sfʊˈmɑːtəʊ/Definition of sfumato noun [mass noun] Art the technique of allowing tones and colours to shade gradually into one another, producing softened outlines or hazy forms. Origin: mid 19th century: Italian, literally 'shaded off', past participle of sfumaresfumato in other Oxford dictionaries Definition of sfumato in the US English dictionary