The meaning of MAD is arising from, indicative of, or marked by mental disorder —not used technically. How to use mad in a sentence.

mad adjective (WANTING) [ after noun ] used for saying that someone wants something very much or thinks about something all the time, in a way that might make them willing to do immoral or extreme …

Mad, crazy, insane are used to characterize wildly impractical or foolish ideas, actions, etc. Mad suggests senselessness and excess: The scheme of buying the bridge was absolutely mad.

1. Wildly; impetuously: drove like mad. 2. To an intense degree or great extent: worked like mad; snowing like mad.

If you're mad about something, you've lost your temper. If you've gone mad, you've lost your mind. Just like it's more common to be angry than to be insane, you're more likely to use mad to describe …

(slang, New England, New York and UK, dialect) Intensifier; to a large degree; extremely; exceedingly; very; unbelievably. He was driving mad slow. It's mad hot today. He seems mad keen on her.

If you say that someone is mad, you mean that they are very angry. You're just mad at me because I don't want to go. You use mad to describe people or things that you think are very foolish. You'd be …

If you run, work, etc like mad, you do it very quickly and with a lot of energy.

If you run, work, etc. like mad, you do it very quickly. (Definition of mad from the Webster's Essential Mini Dictionary © Cambridge University Press)

mad adjective (HURRYING) [ before noun ] hurrying or excited and not having time to think or plan: