The opposite of "am suitable" can vary depending on the context. For instance, if we talk about a job position, then the opposite of "am suitable" can be "am unsuitable" or "am unfit". In a fashion context, the antonyms could be "am unsuitable" or "am inappropriate". In a social scenario, it could be "am mismatched" or "am unfitting". Ultimately, the antonyms for "am suitable" greatly depend on the context and the specific qualities or attributes that are being discussed. However, in general, the opposite of being suitable is being unsuitable or unfit for a particular task, role, or situation.