## Etymology
From un- ('not') + desirable, from desire, from Old French desirer, from Latin desiderare ('to long for, desire'), perhaps originally an augury term, from de- + sidus ('star').

## AI Etymology
Undesirable comes from un- ('not') + desirable, from desire, from Old French desirer, from Latin desiderare ('to long for, desire'), perhaps originally an augury term, from de- + sidus ('star'). The historical chain includes Old English un-, Latin desiderare, and Latin sidus. The quoted older senses, "not", "to long for, desire", and "star", supply the semantic anchors for undesirable. The formation is best read as compound and borrowed: the word undesirable carries its older form-history into a compact English lexical shape. In present English it is used as a adj, "not wanted or desirable; objectionable". English derivatives include undesirability, undesirableness, and undesirably; related English forms include desirable, desire, and desirous. The result is a adj and noun whose etymology preserves both the older form and the later English specialization.

## Topics
- Describing Qualities
- Word Formation & Derivatives

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