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.
实用例句
1. I was wrong about it being a casual meeting.
我误以为这是个非正式会议。
来自柯林斯例句
2. A sharp dresser, Wyatt is never seen in casual clothes.
怀亚特衣着入时，从未有人见过他穿便装。
来自柯林斯例句
3. Lust now seems to be associated with casual sex and loose morals.
**如今似乎与性生活随便和道德放纵联系在一起了。
来自柯林斯例句
4. Garland tried to appear casual, but he couldn't conquer his unease.
