i-adjective
hot-tempered; quick to take offense; touchy
Describes a person who gets angry easily over small things.
彼は怒りっぽいから、気をつけて話さないと。
He's hot-tempered, so I have to be careful how I talk to him.
最近、疲れているせいか、怒りっぽくなって
Lately, maybe because I'm tired, I've become quick to take offense.