Affected, pretentious behavior or manner intended to show off; smug or snobbish attitude.
彼は新しい時計を見せて、きざに話した。
He showed off his new watch and spoke in a pretentious way.
あまりきざな態度を取ると嫌われるよ。
If you act too pretentiously, people will dislike you.
気障なシャツを着ていると冗談を言われた。
Someone joked that he was wearing a snobby shirt.