Meanings
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Thesaurus
Simplified etymology
Loon for a silly person comes from the North American name of the large water bird, recorded in the mid 17th century and associated with its distinctive cry. The personal sense arose in the late 19th century from the bird’s behavior when fleeing danger and may have been influenced by loony, an abbreviation of lunatic.
Etymology
Of North Germanic origin, from Old Norse lómr (“loon”), ultimately imitative of the bird's cry, particularly when it's in danger. Distantly related to lament, probably sharing Proto-Indo-European *leh₂- (expressive root).