na-adjective
short-tempered; quick-tempered
Describes a personality trait of getting angry easily or having a short fuse.
彼は気短で、すぐに怒る。
He is short-tempered and gets angry quickly.
na-adjective
Describes a tendency to act without waiting or thinking things through; often overlaps with being short-tempered but can also refer to general impatience.
気短な人は、行列に並ぶのが苦手だ。
Impatient people don't like waiting in lines.
Compound of 気 (ki, 'spirit, temper') and 短 (mijika, 'short'). The reading きみじか is a rendaku form of き + みじかい.