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Adjective: punchy (punchier,punchiest)  pún-chee
  1. Tired to the point of disorientation or irrationality; punch-drunk
    "After working for 20 hours straight, the team was feeling punchy"
     
  2. Concise and forcefully expressive
    "The article was written in a punchy style that kept readers engaged"

Derived forms: punchiest, punchier

Encyclopedia: Punchy, the Hawaiian Punch Guy