i-adjective
Describes a person who gets angry or frustrated easily; often used for someone with a short fuse.
See also: 気が短い
彼は気の短い人だから、すぐ怒る。
He's quick-tempered, so he gets angry easily.
気の短い上司に注意されて、落ち込んだ。
I felt down after being scolded by my short-tempered boss.