The phrase "comes across with" typically implies that someone is giving a good impression or conveying a positive message. Some antonyms for this phrase could be "falls short," "misses the mark," or "betrays." These words suggest that the person is not meeting expectations or failing to communicate effectively. Other antonyms might include "repels," "displeases," or "offends," indicating a negative reaction or an unwelcome message. Ultimately, the antonyms for "comes across with" depend on the context and the speaker's intentions, but they generally represent a lack of success or a negative impact.