* Arrogant: This is a very common antonym, implying an inflated sense of self-importance and a disregard for others.
* Proud: This can be a positive or negative trait, depending on the context. It can be associated with confidence and self-respect, or it can be used to describe someone who is arrogant and boastful.
* Haughty: This word suggests a feeling of superiority and disdain for others.
* Conceited: This implies an excessive belief in one's own abilities and importance.
* Self-important: This describes someone who believes they are more significant than they are.
* Egotistical: This implies an inflated sense of self-importance and a focus on oneself.
* Boastful: This describes someone who excessively brags about themselves and their accomplishments.
* Pretentious: This suggests someone who tries to appear more important or knowledgeable than they are.
The best word to use will depend on the specific situation and the nuance you want to convey.