וְהַֽנַּעֲרָ֗ טֹבַ֤ת מַרְאֶה֙ מְאֹ֔ד בְּתוּלָ֕ה וְאִ֖ישׁ לֹ֣א יְדָעָ֑הּ וַתֵּ֣רֶד הָעַ֔יְנָה וַתְּמַלֵּ֥א כַדָּ֖הּ וַתָּֽעַל׃
And the damsel was very fair to look upon, a virgin, neither had any man known her; and she went down to the fountain, and filled her pitcher, and came up.
Rashbam on Genesis
ואיש לא ידעה, she had not even engaged in fondling with a man. She was extremely chaste.