## Etymology
From Middle English adel ('rotten, filth'), from Old English adela ('mire, liquid filth'); the verb sense 'to confuse' arose from the figurative notion of an addled (rotten) egg.

## AI Etymology
Addle is a verb and adjective meaning "to confuse or muddle; (of an egg) to become rotten". Historically, it is from Middle English adel ('rotten, filth'), from Old English adela ('mire, liquid filth'); the verb sense 'to confuse' arose from the figurative notion of an addled (rotten) egg. The semantic history matters here: the earlier use is the starting point, and the modern sense, "to confuse or muddle; (of an egg) to become rotten", is the later or specialized English value. The historical chain is anchored in Old English adela. Close English family members include addled, addlebrained, addlepated, and addlehead.

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