expression, i-adjective
hasty; impatient; quick to jump to conclusions
Describes a person who acts or decides too quickly, often without enough thought. The expression 気が早い is more common; 気の早い is its attributive form.
See also: 気が早い
彼は気の早いところがあって、まだ決まっていないのに旅行の準備を始めた。
He's a bit hasty; he started preparing for the trip even though nothing has been decided yet.
気の早い人は、相手の話を最後まで聞かずに結論を出してしまう。
Impatient people jump to conclusions without listening to the other person's full story.
A phrase combining 気 (spirit, mind) and 早い (fast, early), literally 'fast-minded'. The exact historical derivation is uncertain, but it follows a common pattern of describing temperament with 気.