1. insanely or wildly: The old witch cackled madly.
  2. with desperate haste or intensity; furiously: They worked madly to repair the bridge.
  3. foolishly: They lived madly, wasting all their money.
  4. extremely: They’re madly in love.


  1. in an insane or foolish manner
  2. with great speed and energy
  3. informal extremely or excessivelyI love you madly

adv.early 13c., from mad (adj.) + -ly (2). Colloquial meaning “passionately” had emerged by 18c.

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