mad

Universal Words adjective (madder, maddest) 1 (especially BrE) (also crazy AmE, BrE) having a mind that does not work normally; mentally ill: They realized that he had gone mad. * Inventors are not mad scientists. * She seemed to have gone stark raving mad. * A revolver is the only way to stop a mad dog. seealsoBARKINGMAD 2 (informal, especially BrE) (also crazy AmE, BrE) very stupid; not at all sensible: You must be mad to risk it. * It was a mad idea. * 'I'm going to buy some new clothes.' 'Well, don't go mad (= spend more than is sensible).' 3 [notbeforenoun] ~ (at / with sb)