Amnon became so obsessed that he made himself sick over his sister Tamar, for she was a virgin, and it seemed impossible to Amnon to do anything to her.
In context
1Some time later, Absalom son of David had a beautiful sister named Tamar, and Amnon son of David fell in love with her. 2Amnon became so obsessed that he made himself sick over his sister Tamar, for she was a virgin, and it seemed impossible to Amnon to do anything to her. 3Amnon had a friend named Jonadab, son of David’s brother Shimeah, and Jonadab was a very shrewd man. 4He said to him, “Why are you, the king’s son, looking so worn out morning after morning? Won’t you tell me?” Amnon said to him, “I am in love with Tamar, my brother Absalom’s sister.”