trigger-happy

[ trig-er-hap-ee ]
/ ˈtrɪg ərˌhæp i /

adjective Informal.

ready to fire a gun at the least provocation, regardless of the situation or probable consequences: a trigger-happy hunter.
heedless and foolhardy in matters of great importance and recklessly advocating action that can result in war: Some called him a trigger-happy candidate.
eager to point out the mistakes or shortcomings of others; aggressively or wantonly critical: He's a trigger-happy editor with a nervous blue pencil.

Origin of trigger-happy

First recorded in 1940–45

Example sentences from the Web for trigger-happy

British Dictionary definitions for trigger-happy

trigger-happy

adjective informal

tending to resort to the use of firearms or violence irresponsibly
tending to act rashly or without due consideration