Being the ticket means that something is just what you need or wanted. It describes something that is perfect for a specific situation or purpose. However, the antonyms for this phrase include unsuitable, inadequate, inappropriate, and unhelpful. If something is unsuitable, it is not the right thing for a particular situation or purpose. An inadequate item is not enough or sufficient to fulfill a need. Inappropriate objects are not suitable or fitting for a specific context or situation. Lastly, unhelpful items are not beneficial or useful in achieving a particular goal. Therefore, being the ticket has a clear opposite in terms of suitability, sufficiency, context, and usefulness.