dou·ble–deal·ing 
/ˌdʌbəlˈdi:lɪŋ/ noun
/ˌdʌbəlˈdi:lɪŋ/ noun [noncount] : the practice of pretending to do or think one thing while really doing or thinking something different : dishonest or deceptive behavior
▪ His double-dealing [=duplicity, deceitfulness] has caused many of his former friends to distrust him.
▪ His double-dealing [=duplicity, deceitfulness] has caused many of his former friends to distrust him.
— dou·ble–deal·er /ˌdʌbəlˈdi:lɚ/ noun, plural dou·ble–deal·ers [count]
/ˌdʌbəlˈdi:lɚ/ noun, plural dou·ble–deal·ers [count]— double–dealing adjective
▪ He could no longer trust his double-dealing friend.
▪ He could no longer trust his double-dealing friend.
