hotheaded is a compound of hot (Old English hāt) + headed, from head (Old English hēafod), describing a 'hot head' or fiery temperament. Morphologically, the word is best read through the components named in the history, with the modern spelling preserving a compound structure rather than a single unanalyzable stem. In present English, the adjective sense is "impetuous, quick-tempered, or rash", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as hothead, hot, and head, and in derivatives such as hotheadedly and hotheadedness. Its semantic neighborhood includes impetuous, rash, quick-tempered, and hasty, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English hāt and Old English hēafod.