Crazy

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From WikiAnswers: c.1369, probably from Old Norse *krasa ("shatter"), perhaps via an Old French form. Originally "to shatter;" now-obsolete metaphoric use for "break down in health" (1476) led to n. sense of "mental breakdown." Extension to "mania, fad," is first recorded 1813. Original sense preserved in crazy quilt pattern. Crazy is from 1576 as "sickly;" from 1617 as "insane;" and from 1927 in jazz slang for "cool, exciting." Phrase crazy like a fox recorded from 1935.
From EtymOnline: 1570s, "diseased, sickly," from craze + -y (2). Meaning "full of cracks or flaws" is from 1580s; that of "of unsound mind, or behaving as so" is from 1610s. Jazz slang sense "cool, exciting" attested by 1927. To drive (someone) crazy is attested by 1873. Phrase crazy like a fox recorded from 1935. Crazy Horse, Teton Lakhota (Siouan) war leader (d.1877) translates thaÅ¡uka witko, lit. "his horse is crazy."

Full definition of crazy

1663, Samuel Butler, HudibrasOver moist and crazy brains.
1913, Joseph C. Lincoln, Mr. Pratt's Patients Chapter 5, Of all the queer collections of humans outside of a crazy asylum, it seemed to me this sanitarium was the cup winner. â€¦ When you're well enough off so's you don't have to fret about anything but your heft or your diseases you begin to get queer, I suppose.

He went crazy when he won.
In love; experiencing romantic feelings.
Why is she so crazy about him?
(informal) Unexpected; surprising.
The game had a crazy ending
Characterized by weakness or feebleness; decrepit; broken; falling to decay; shaky; unsafe.

(plural crazies)