mad

To be or become mad.

To madden, to anger, to frustrate.

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.

Intensifier; to a large degree; extremely; exceedingly; very; unbelievably.

“He seems mad keen on her.”