The difference between Mad and Wicked

When used as adverbs, mad means intensifier, whereas wicked means very, extremely.

When used as adjectives, mad means insane, whereas wicked means evil or mischievous by nature.

Mad is also verb with the meaning: to be or become mad.

Wicked is also noun with the meaning: people who are wicked.

check bellow for the other definitions of Mad and Wicked

Mad as an adjective:

Insane; crazy, mentally deranged.

Examples:

"You want to spend $1000 on a pair of shoes? Are you mad?"

"He's got this mad idea that he's irresistible to women."
Mad as an adjective (chiefly, US; UK dated + regional):

Angry, annoyed.

Examples:

"Are you mad at me?"
Mad as an adjective:

Wildly confused or excited.

Examples:

"to be mad with terror, lust, or hatred"
Mad as an adjective:

Extremely foolish or unwise; irrational; imprudent.
Mad as an adjective (colloquial, usually with ''for'' or ''about''):

Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.

Examples:

"Aren't you just mad for that red dress?"
Mad as an adjective (of animals):

Abnormally ferocious or furious; or, rabid, affected with rabies.

Examples:

"a mad dog"
Mad as an adjective (slang, chiefly Northeastern US):

Intensifier, signifies an abundance or high quality of a thing; very, much or many.

Examples:

"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."
Mad as an adjective (of a compass needle):

Having impaired polarity.

Mad as an adverb (slang, New England, New York, and, UK, dialect):

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

Examples:

"He was driving mad slow."

"It's mad hot today."

"He seems mad keen on her."

Mad as a verb (obsolete, intransitive):

To be or become mad.
Mad as a verb (now, _, colloquial, _, US):

To madden, to anger, to frustrate.

Wicked as an adjective:

Evil or mischievous by nature.
Wicked as an adjective (slang):

Excellent; awesome; masterful

Examples:

"That was a wicked guitar solo, bro!"
Wicked as an adjective (UK, dialect, obsolete):

Active; brisk.

Wicked as an adverb (slang, New England, British):

Very, extremely.

Examples:

"The band we went to see the other night was wicked loud!"

Wicked as an adjective:

Having a wick.

Examples:

"a two-wicked lamp"
Wicked as an adjective (British, dialect, chiefly, Yorkshire):

Infested with maggots.