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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"); meaning "showing lack of interest" is from 1916. Of clothes, "informal," from 1891. Related: Casually.

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Definitions of casual

casual (adj.)
occurring or appearing or singled out by chance;
seek help from casual passers-by
a casual meeting
Synonyms: chance
casual (adj.)
hasty and without attention to detail; not thorough;
a casual (or cursory) inspection failed to reveal the house's structural flaws
casual (adj.)
marked by blithe unconcern;
showed a casual disregard for cold weather
an ability to interest casual students
Synonyms: insouciant / nonchalant
casual (adj.)
without or seeming to be without plan or method; offhand;
a casual remark
information collected by casual methods and in their spare time
casual (adj.)
appropriate for ordinary or routine occasions;
casual clothes
Synonyms: everyday / daily
casual (adj.)
occurring on a temporary or irregular basis;
a casual correspondence with a former teacher
casual employment
Synonyms: occasional
casual (adj.)
characterized by a feeling of irresponsibility; "a broken back is nothing to be casual about; it is no fooling matter";
Synonyms: fooling
casual (adj.)
natural and unstudied;
using their Christian names in a casual way
Synonyms: free-and-easy
casual (adj.)
not showing effort or strain;
a difficult feat performed with casual mastery
Synonyms: effortless
From wordnet.princeton.edu