adj
mad
MAD
adj
1
Angry or annoyed.
"She was mad at her brother for breaking her phone."
"Don't get mad, just tell me what happened."
2
Mentally ill or seriously irrational; insane.
"The old story tells of a king who slowly went mad."
"You'd have to be mad to try that jump."
3
Extremely enthusiastic about something; infatuated.
"He's mad about football and never misses a match."
4
(informal) Used to mean a large amount or a high degree of something.
"That car has mad speed for the price."
How to Use Mad
Learner’s notesIn plain EnglishAngry, or (in the older sense) mentally unwell — context tells you which.
UK vs US
In American English, "mad" very commonly just means "angry"; in British English "angry" is more standard and "mad" leans toward "crazy" or "insane".
Common pairings
mad at someone
go mad
mad about
Word Forms
madder comparative, madded past tense, mads singular, maddest superlative
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Etymology
From Old English gemæd(ed), "made insane", tracing back to a Proto-Germanic root meaning "to change or damage".