ないき
shy; timid; introverted
adjective
彼は内気な性格なので、初めての人と話すのが苦手です。
He is shy by nature, so he has difficulty talking to people he meets for the first time.
姉は元気で社交的だが、妹は内気でおとなしい。
The older sister is energetic and sociable, but the younger sister is shy and quiet.
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