crazy

Meanings

1. 1
   adj

   Very foolish, strange, or hard to believe.

   His plan sounded completely crazy at first.

2. 2
   adj

   Extremely excited, wild, or out of control.

   The crowd went crazy when the team scored.

3. 3
   adj

   Very enthusiastic about or fond of something.

   He is crazy about cars and racing.

4. 4
   adj

   Mentally ill; insane.

   They thought the old man had gone crazy.

From craze (“to crush”) + -y, akin to being "crazed up". Compare cracked up (“suffered a mental breakdown; be insane”), crackpot. Compare typologically Russian чо́кнутый (čóknutyj).

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