Berean Standard Bible (BSB)
Amnon was sick with frustration over his sister Tamar, for she was a virgin, and it seemed implausible for him to do anything to her.
World English Bible (WEB)
Amnon was so troubled that he fell sick because of his sister Tamar; for she was a virgin; and it seemed hard to Amnon to do anything to her.
Strong's King James
And Amnon{H550} was so vexed{H3334}{(H8799)}, that he fell sick{H2470}{(H8692)} for his sister{H269} Tamar{H8559}; for she was a virgin{H1330}; and Amnon{H550} thought{H5869} it hard{H6381}{(H8735)} for him to do{H6213}{(H8800)} any thing{H3972} to her.
The F.O.G *
The F.O.G Message *
Young's Literal Translation
And Amnon hath distress—even to become sick, because of Tamar his sister, for she is a virgin, and it is hard in the eyes of Amnon to do anything to her.