ahitophel

/AE1 IH1 T AH0 F AH0 L/
noun
  1. 1

    A wise counsellor of King David in the Bible, who during Absalom's revolt deserted David (Psalm 41:9; 55:12–14) and supported Absalom (2 Samuel 15:12).

  2. 2

    Any wise but unprincipled advisor.