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Adjective: hotheaded  'hót'he-did
  1. Quickly aroused to anger
    "a hotheaded commander";
    - choleric, irascible, hot-tempered, quick-tempered, short-tempered
  2. Characterized by undue haste and lack of thought or deliberation
    "a hotheaded decision";
    - impulsive, impetuous, madcap, tearaway, brainish [archaic]

See also: ill-natured, incautious