The Collaborative International Dictionary of English v.0.48:

Hot-headed \Hot"-head`ed\, a.
   quickly and easily aroused to anger; fiery; violent; rash;
   hasty; impetuous; vehement; as, a hot-headed commander.
   [WordNet sense 1] --Macaulay.

   Syn: choleric, irascible, hotheaded, hot-tempered,
        quick-tempered, short-tempered.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

hotheaded \hotheaded\ adj.
   1. same as hot-headed.

   Syn: choleric, irascible, hot-headed, hot-tempered,
        quick-tempered, short-tempered.
        [WordNet 1.5]

   2. liable to act with undue haste and without consideration.

   Syn: brainish, impulsive, impetuous, madcap,
        tearaway(prenominal).
        [WordNet 1.5]