"Smart-arse" is a term used to describe someone who is excessively clever and arrogant. However, there are many synonyms for this term that can be used depending on the situation and context. Some of the more common alternatives include "know-it-all", "wise guy", "smart aleck", "clever dick", and "big shot". Other options might include "arrogant brand", "smarty-pants", "conceited genius", "uppity intellect", or "pompous brain". Whatever term you choose to use, just be sure to use it wisely and avoid offending the person you are referring to, as being called a "smart-arse" or any of its synonyms can be quite insulting to many people.