Insane; crazy, mentally deranged.
He's got this mad idea that he's irresistible to women.
(chiefly US; informal in UK) Angry, annoyed.
Are you mad at me?
Bizarre; incredible.
It's mad that I got that job back a day after being fired.
Wildly confused or excited.
to be mad with terror, lust, or hatred
Extremely foolish or unwise; irrational; imprudent.
(usually with for or about) Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.
Aren't you just mad for that red dress?
(of animals) Abnormally ferocious or furious; or, rabid, affected with rabies.
a mad dog
(chiefly Northeastern US) Intensifier, signifies an abundance or high quality of a thing; very, much or many.
I gotta give you mad props for scoring us those tickets. Their lead guitarist has mad skills. There are always mad girls at those parties.
(of a compass needle) Having impaired polarity.