Definition from macmillandictionary.com
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You’ll think I’m mad – I’ve just left my job.
You’re mad to spend so much money on clothes.
a mad scientist
She was completely mad.
He makes me mad, the way he keeps criticizing me all the time.
My boss is mad with me for missing the meeting.
There were people everywhere – it was all a bit mad!
It was a mad rush to get the job finished.
Mom will be mad as a wet hen if we don't get home soon.
The young fellow is as mad as a March hare.
Your dad will be as mad as hell when he finds out you took his car.
I will be mad as hell if he gets here late.