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1. Extremely foolish or silly.

2. Crazy; insane.

Source: Answers.com

In the old days people believed that psyhcological disorders were affected or triggered by cycles of the moon. The word looney comes from the word luner meaning moon. The wherewolf legend was based on this theory. many people with Bipolar disorder still claim that moon cycles affect their mood, but this hasn't been proven as a scientific fact yet.

Since you ask about "a" looney, I think you are asking about the Canadian coin and not wanting a definition of the adjective. The Looney is a $1 coin that shows a loon on the reverse. See the related link below for a picture.

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13y ago

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