The phrase "are just the ticket" means something is exactly what is needed or appropriate. Antonyms for this phrase could be "not suitable," "wrong choice," "inappropriate," or "insufficient." For example, if someone needs a warm coat for a winter day, but is given a light jacket instead, the jacket is not just the ticket for the situation. Similarly, if a patient needs a specific medication to treat their illness, but is given the wrong medication, it is not just the ticket for their condition. The opposite of "are just the ticket" is the feeling of dissatisfaction or disappointment when something is not suitable or sufficient for a particular need or situation.