The phrase "being just the ticket" means that something is exactly what is needed or desired. Antonyms for this phrase could include expressions such as "not quite right," "inadequate," "unacceptable," or "unsatisfactory." These words would suggest that the item in question did not meet expectations or failed to fulfill its purpose. Other antonyms for "being just the ticket" might include phrases such as "missing the mark," "being off-target," or "failing to hit the spot." These expressions indicate that something missed the mark or was not quite on point. Overall, antonyms for "being just the ticket" emphasize the idea of something being deficient or not up to the task.