mad
Mentally ill or insane. / Feeling strong annoyance or anger. / Extremely enthusiastic or passionate about something.
Adjective
comp: maddersup: maddest
This word carries a heavy duality depending on the dialect. In British English, it frequently denotes actual insanity or a wild, eccentric personality. In American English, it is most commonly used as a synonym for angry, often in casual or domestic settings.
Meanings
Examples
My brother is absolutely mad about vintage cars.