כי בתולה היא. צנועה בבית ואינה יוצאת לחוץ, לפיכך ויפלא בעיני אמנון וגו', נכסה ונעלם ממנו מה תואנה יכול לבקש וישכב עמה, כמו (דברים יז ח): כי יפלא ממך, ארי יתכסי ממך:
Because she was a virgin. She was modest [and stayed] in the house and did not go outside therefore, "It was hidden from the eyes of Amnon… It was covered and hidden from him. What excuse he could seek [in order] to lay with her.1According to Rashi, the words in our verse, “because she was a virgin” do not tell us why Amnon was desirous of her. The reason for his desire was because she was pretty. Rashi consequently explains that these words are telling us why she was inaccessible to Amnon and are connected to the words that follow, “it was hidden in the eyes of Amnon” to find a way to lay with her. Similar to "When it is concealed from you",2Devorim 17:8. [which] Onkelus translates: "When it is hidden from you."