deceitfulPronunciation: /dɪˈsiːtfʊl, -f(ə)l/Translate deceitful | into French | into German | into Italian | into Spanish Definition of deceitful adjective guilty of or involving deceit; deceiving or misleading others:a deceitful politician such an act would have been deceitful and irresponsibleDerivatives deceitfully adverb deceitfulness noun deceitful in other Oxford dictionaries Definition of deceitful in the US English dictionary