An equivalent of ‘you idiot’, used to a person who is acting foolishly. The word derives from Latin luna, ‘moon’ and reflects the ancient belief that insane behaviour was dependent on changes in the moon. It is a word used by...

A shortened phonetic form of ‘lunatic’ used to mean a foolish person. ‘Loony’ could also be considered as a diminutive of ‘loon’, making that term more friendly. ‘You old loony’ is used by a young man to...

A lunatic (colloquially: "looney") is a commonly used term for a person who is mentally ill, dangerous, foolish or unpredictable, a condition once called lunacy. The word lunatic is borrowed from Latin "lunaticus", which gains its stem from "luna" for...