Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rash or hotheaded person.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Hot-headed; rash.

from The Century Dictionary and Cyclopedia

  • n. A rash or hot-headed person; a harebrained person.
  • Harebrained; hot-headed; rash.

Etymologies

mad +‎ brain (Wiktionary)

Examples

  • Colonel Halkett gave up his daughter for lost when she did not appear at the breakfast-table: for yet more decidedly lost when the luncheon saw her empty place; and as time drew on toward the dinner-hour, he began to think her lost beyond hope, embarked for good and all with the madbrain.

    Beauchamp's Career — Volume 5

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