Definitions

1. noun

A traitor or false friend, especially a counselor or advisor who betrays trust.

“The king’s advisor turned out to be an achitophel, revealing the kingdom’s secrets to the enemy.”

2. proper noun

A biblical figure, a counselor of King David who plotted against him (2 Samuel 15-17).

“According to the Bible, Achitophel’s betrayal led to the rebellion against King David.”