na-adjective, noun
Describes a person who is easily irritated or hasty; often used with な to modify nouns.
彼は気早な性格で、すぐに怒ってしまう。
He has a quick-tempered personality and gets angry easily.
気早な人は、待つのが苦手だ。
Impatient people are not good at waiting.
Compound of 気 (ki, 'spirit, temper') and 早 (haya, 'quick, early'), with rendaku voicing. The exact historical derivation is uncertain, but the meaning follows naturally from the components.