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Synonyms for Hotheaded (same or very similar meaning)

WordNet sense 1 (quickly aroused to anger):
choleric, hot-tempered, irascible, quick-tempered, short-tempered

WordNet sense 2 (having an irritable and unpleasant disposition):
ill-natured

WordNet sense 3 (characterized by undue haste and lack of thought or deliberation):
impetuous, impulsive, madcap, brainish, tearaway

WordNet sense 4 (lacking in caution):
incautious


From the ODE community, based on WordNetadd/edit