ichidan verb, intransitive verb
be conceited; be vain; have a big head
Describes someone who overestimates their own ability, appearance, or worth. Often used in negative or admonishing contexts.
彼は自分の才能にうぬぼれている。
He is conceited about his own talent.
うぬぼれる
Don't get a big head. You're still inexperienced.