deceitful deceitful /dɪˈsiːtfəl/

adjective

1. Marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another  ( ambidextrous , deceitful , double-dealing , double-faced , double-tongued , duplicitous , Janus-faced , two-faced )
   marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
    She was a deceitful scheming little thing
   she was a deceitful scheming little thing
    A double-dealing double agent
   a double-dealing double agent
    A double-faced infernal traitor and schemer
   a double-faced infernal traitor and schemer
   
2. Intended to deceive  ( deceitful , fallacious , fraudulent )
   intended to deceive
    Deceitful advertising
   deceitful advertising
    Fallacious testimony
   fallacious testimony
    Smooth, shining, and deceitful as thin ice
   smooth, shining, and deceitful as thin ice
    A fraudulent scheme to escape paying taxes
   a fraudulent scheme to escape paying taxes