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Adjective: trigger-happy  'tri-gu(r),ha-pee
  1. Irresponsible in the use of firearms
    "The trigger-happy soldier was reprimanded for firing without orders"
     
  2. Marked by extreme intensity of emotions or convictions; inclined to react violently; fervid
    "trigger-happy loyalty";
    - fierce, tearing, vehement, violent

See also: intense, irresponsible

Encyclopedia: Trigger-happy