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English definition of “trigger-happy”

trigger-happy

adjective     /ˈtrɪɡ.əˌhæp.i/ US  /-ɚ-/
informal describes someone who often uses his or her gun, shooting with very little reason: Their police are worryingly trigger-happy.Violent or aggressiveUnkind, cruel and unfeelingTreating people or animals badly disapproving ready to use violence or force immediately, without careful thoughtViolent or aggressiveUnkind, cruel and unfeelingTreating people or animals badlyDoing things without fear or proper thought
(Definition of trigger-happy adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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