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"mad" is also used as a crossword clue. If that's what you saw, the answer is often crazy (5 letters).
Definitions
Angry, foolish, or mentally disturbed.
Word origin
From Middle English madden, from the adjective; compare Old English ġemǣdan.
Used in a sentence
“You want to spend a thousand pounds on a pair of shoes? Are you mad?”
“He's got this mad idea that he's irresistible to women.”
“I have heard my grandsire say full oft, / Extremity of griefs would make men mad.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer3 curated clues
01“Fuming”3 letters
02“Seeing red”3 letters
03“Insane”3 letters
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