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happening by chance; fortuitous:
a casual meeting.
without definite or serious intention; careless or offhand; passing:
a casual remark.
seeming or tending to be indifferent to what is happening; apathetic; unconcerned:
a casual, nonchalant air.
without emotional intimacy or commitment:
casual sex.
appropriate for wear or use on informal occasions; not dressy:
casual clothes; casual wear.
irregular; occasional:
a casual visitor.
accidental:
a casual mishap.
noting or relating to video games that do not require much skill or time commitment, or noting a player of such games:
casual gamers.
Compare hard-core (def 6).
Obsolete. uncertain.
a worker employed only irregularly.
a soldier temporarily at a station or other place of duty, and usually en route to another station.
Usually Disparaging. a person who plays video games that do not require much skill or time commitment.
Historical Examples

With the casualness of habit, she pulled her smock up to her middle and dropped on the bed, fat thighs comfortably wide.
Wilderness of Spring Edgar Pangborn

“Oh, anything you order,” said Locuty with an effort at casualness.
Secret Armies John L. Spivak

With an elaborate show of casualness he shrugged his shoulders.
The Black Tide Arthur G. Stangland

Her preparation of Aunt Rosamund for the reception of Fiorsen was a masterpiece of casualness.
Beyond John Galsworthy

She announced her plan this morning with an extra note of casualness in her voice.
What Not Rose Macaulay

He had been thinking upon his sin and was startled at the casualness of the question.
Stubble George Looms

She made an effort at casualness: “Let’s see what Daddy’s doing back there.”
Tree, Spare that Woodman Dave Dryfoos

The thing that was constantly impressing me was their casualness.
Tripping with the Tucker Twins Nell Speed

And he was astonished at the casualness with which she spent money in every shop that caught her fancy.
Evelyn Innes George Moore

“Yes,” said he, with all the casualness that he could assume.
Buried Alive: A Tale of These Days Arnold Bennett

adjective
happening by accident or chance: a casual meeting
offhand; not premeditated: a casual remark
shallow or superficial: a casual affair
being or seeming unconcerned or apathetic: he assumed a casual attitude
(esp of dress) for informal wear: a casual coat
occasional or irregular: casual visits, a casual labourer
(biology) another term for adventive
noun
(usually pl) an informal article of clothing or footwear
an occasional worker
(biology) another term for an adventive
(usually pl) a young man dressed in expensive casual clothes who goes to football matches in order to start fights
n.

1730, from casual (adj.) + -ness.
adj.

late 14c., “subject to or produced by chance,” from Middle 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; meaning “showing lack of interest” is from 1916. Of clothes, “informal,” from 1939. Related: Casually.