na-adjective, noun
Describes a person's disposition as introverted, shy, or hesitant in social situations. Often used with な to modify nouns or as a predicate.
彼女は内気で、人前で話すのが苦手だ。
She is shy and not good at speaking in front of people.
内気な性格を直したいと思っている。
I want to overcome my shy personality.