Etymology
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casual (adj.)

late 14c., casuel, "subject to or produced by chance," from Old French casuel (15c.), from Late Latin casualis "by chance," from Latin casus "chance, occasion, opportunity; accident, event" (see case (n.1)).

Of persons, in the sense of "not to be depended on, unmethodical," it is attested from 1883 (from the notion of "without regularity," hence "uncertain, unpredictable"); the meaning "showing lack of interest" is from 1916. Of clothes, "informal," from 1891. Related: Casually.

updated on November 12, 2022

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