New Revised Standard Version
Amnon was so tormented that he made himself ill because of his sister Tamar, for she was a virgin and it seemed impossible to Amnon to do anything to her.

Contemporary English Version
But Tamar was a virgin, and Amnon could not think of a way to be alone with her. He was so upset about it that he made himself sick.

New American Bible
He was in such anguish over his sister Tamar that he became sick; she was a virgin, and Amnon thought it impossible to do anything to her.

Douay-Rheims Bible
And he was exceedingly fond of her, so that he fell sick for the love of her: for as she was a virgin, he thought it hard to do any thing dishonestly with her.

And he was exceedingly fond of her, so that he fell sick for the love of her: for as she was a virgin, he thought it hard to do any thing dishonestly with her.

vexed

1 Kings 21:4 And Achab came into his house angry and fretting, because of the word that Naboth, the Jezrahelite, had spoken to him, saying: I will not give thee the inheritance of my fathers. And casting himself upon his bed, he turned away his face to the wall, and would eat no bread.

Songs 5:8 I adjure you, O daughters of Jerusalem, if you find my beloved, that you tell him that I languish with love.

2 Corinthians 7:10 For the sorrow that is according to God worketh penance, steadfast unto salvation: but the sorrow of the world worketh death.

Amnon, etc.