What does mad mean?
Mad is an informal adjective with several closely related uses. Most commonly, it describes a person who is very angry: one may be mad with someone, mad at someone, or mad about something. It can also describe mental illness or irrational, uncontrollable behaviour, although this use is now especially associated with the informal expression 'gone mad'. A further common sense describes intense enthusiasm, especially in British English, as in being mad about a performer, hobby, or place. In phrases such as 'a mad rush' or 'mad money', it suggests frenzy, disorder, or extreme excess. Although mad can sound harsh or insulting when used to describe someone’s behaviour, it is often playful in contexts involving excitement or strong admiration. The word is widely understood in both British and American English but is more conversational in tone than precise clinical or legal descriptions of mental illness.
adjectiveMad chiefly means very angry or mentally unwell or behaving in a wild, irrational way. It can also mean intensely enthusiastic or excited about something.
- Very angry or enraged, especially in informal speech.
- Mentally unwell, irrational, or behaving in a wild and uncontrollable way, especially in informal speech.
- Intensely enthusiastic or excited about something.
- Wildly energetic, chaotic, or difficult to control, as in a mad rush.
"She was mad with her brother for forgetting to call."
"Dad was absolutely mad when he saw the damage to the car."
"The whole town went mad when their team won the championship."
"She has been mad about the new exhibition for months."
Before describing extreme anger, mad originally conveyed a mind that had been driven into confusion or frenzy.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mad come from?
The word descends from Old English gemædd, originally meaning 'out of one's mind' or 'confused, frantic'. Its sense of extreme anger developed later through the idea of a person driven mad by anger. Modern uses for insanity, enthusiasm, and frantic activity continue this broad association with emotional disturbance and loss of control.
Related word forms
How mad is actually used
Mad is informal in nearly all of its modern uses. In British English it is especially common for enthusiastic devotion, as in mad about someone or something. The older literary sense 'insane' may be formal or poetic.
Easily confused with mad
Mad means angry, mentally unwell, or wildly enthusiastic, whereas made is the past tense and past participle of make.