Antonyms for the phrase "sweep off feet" could include "repulse," "disgust," or "revulse." These words indicate a negative or unpleasant response to someone's actions, rather than the positive, enamored response that "sweep off feet" suggests. Other antonyms might include "unimpress," "bore," "ignore," or "overlook," all of which suggest a lack of interest rather than the intense attraction implied by the original phrase. Using these antonyms can help to convey a sense of disinterest or aversion when describing a character's reaction to another's behavior, rather than emphasizing their attraction.