|—adj (foll by about, on, |
|1.||mentally deranged; insane|
|2.||senseless; foolish: a mad idea|
|4.||wildly enthusiastic (about) or fond (of): mad about football; football-mad|
|5.||extremely excited or confused; frantic: a mad rush|
|6.||temporarily overpowered by violent reactions, emotions, etc: mad with grief|
|a. unusually ferocious: a mad buffalo|
|b. afflicted with rabies|
|8.||informal like mad with great energy, enthusiasm, or haste; wildly|
|9.||mad as a hatter crazily eccentric|
|—vb , madder, maddest, mads, madding, madded|
|10.||archaic to make or become mad; act or cause to act as if mad|
|[Old English gemǣded, past participle of gemǣdan to render insane; related to gemād insane, and to Old High German gimeit silly, crazy, Old Norse meitha to hurt, damage]|
Suffering from a disorder of the mind; insane.
Affected by rabies; rabid.
mad as a hatter
Also, mad as a March hare. Crazy, demented, as in She is throwing out all his clothes; she's mad as a hatter. This expression, dating from the early 1800s, alludes to exposure to the chemicals formerly used in making felt hats, which caused tremors and other nervous symptoms. The variant, dating from the 14th century, alludes to the crazy behavior of hares during rutting season, mistakenly thought to be only in March.