1
- relaxed and unconcerned轻松的; 漠不关心的：
she regarded his affairs with a casual indulgence
她以无所谓的纵容对待他的风流事
he tried to make his voice sound casual.
他极力使他的声音听起来轻松些。
1.1
- made or done without much thought or premeditation不过多考虑的; 没有预先计划的：
a casual remark.
随口说出的话。
1.2
- done or acting in a desultory way无条理的; 散漫的; 不连贯的：
to the casual observer, rugby looks something like football.
对漫不经心的旁观者来说, 橄榄球看上去像足球。
1.3
- done or acting without sufficient care or thoroughness不认真的; 不彻底的：
the casual way in which victims were treated.
对受害者随随便便的处理方式。
2
- not regular or permanent不定期的; 非永久的：
the tent is ideal for casual outdoor use
这个帐篷是临时户外使用的理想之物
casual jobs.
临时工作。
2.1
- (of a worker) employed on a temporary or irregular basis（工人）临时（或不定期）聘用的：
casual staff.
临时工作人员。
2.2
- (of a sexual relationship or encounter) occurring between people who are not regular or established sexual partners（性关系, 相遇）萍水相逢的; 一夜情的。
3
- attrib. happening by chance; accidental偶然的; 意外的：
he pretended it was a casual meeting.
他假装那是次意外相见。
4
- without formality of style, manner, or procedure, in particular（风格、方式或步骤）非正式的, 尤指：
4.1
- (of clothes or a style of dress) suitable for everyday wear rather than formal occasions（衣服, 服装式样）适合日常穿着的; 便服的。
4.2
- (of a social event) not characterized by particular social conventions（社会事件）不拘礼节的。
4.3
- (of a place or environment) relaxed and friendly（地方, 环境）轻松而友好的：
the inn's casual atmosphere.
这个旅馆的轻松友好的气氛。
1
- a person who does something irregularly偶尔做某事的人：
a number of casuals became regular customers.
许多不固定的顾客成了定期客户。
1.1
- a worker employed on an irregular or temporary basis临时工。
1.2
- historical a person admitted to a workhouse for a short period〈史〉济贫院短期居住者。
2
- (casuals) clothes or shoes suitable for everyday wear rather than formal occasions便服, 便装, 便鞋。
3
- Brit. a youth belonging to a subculture characterized by the wearing of expensive casual clothing and frequently associated with football hooliganism〈英〉散漫青年（以穿昂贵的休闲装, 常参与足球流氓行为为特征的亚文化群体）。
派生词
casually
adverbcasualness
noun词源
late Middle English (in senses 2 and 3 of the adjective)： from Old French casuel and Latin casualis, from casus 'fall' （compare with CASE1）.