quick temper

quick temper AND short temper — вспыльчивость; горячность (отсюда short-tempered)

have a quick temper AND be short-tempered (to lose one's temper easily) — быть раздражительным, вспыльчивым

Example 1: I don't know what's the matter with you lately. You've always got such a quick temper. (SS)

Example 2: I'd be careful what you say to Melanie. She's got rather a quick temper.