bigheaded
/ˈbɪɡˌhɛdɪd/
adjective
- Having an exaggerated sense of one's own importance or abilities; conceited.
- His bigheaded attitude made it hard for anyone to work with him.
- She's not bigheaded at all, despite being the best player on the team.
- After winning the award, he became so bigheaded that he wouldn't talk to his old friends.
Synonyms