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mad

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mad/ˈmæd/adjective
maddermaddest
mad
/ˈmæd/
adjective
maddermaddest
Learner's definition of MAD  
not used before a nounchiefly US, informal  : very angry
— see also fighting mad at 1fight
: having or showing severe mental illness : insane
   b  : unable to think in a clear or sensible way
   c  : very foolish
chiefly British, informal  : liking someone or something very much : very fond of or enthusiastic about someone or something — often + about
always used before a noun  : wild and uncontrolled

drive (someone) mad

: to cause (someone) to become mentally ill
: to annoy or bother (someone) very much.

go mad

: to become mentally ill
: to act in a way that is out of control : to act wildly

like mad

informal
: with a lot of energy and speed
: very quickly
: very much

mad as a hatter

— see hatter
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