词典释义：
relaxed and unconcerned
轻松的；漠不关心的
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she regarded his affairs with a casual indulgence 她以无所谓的纵容对待他的风流事
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he tried to make his voice sound casual .他极力使他的声音听起来轻松些。
made or done without much thought or premeditation
不过多考虑的；没有预先计划的
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a casual remark .随口说出的话。
done or acting in a desultory way
无条理的；散漫的；不连贯的
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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。
done or acting without sufficient care or thoroughness
不认真的；不彻底的
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the casual way in which victims were treated .对受害者随随便便的处理方式。
not regular or permanent
不定期的；非永久的
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the tent is ideal for casual outdoor use 这个帐篷是临时户外使用的理想之物
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casual jobs .临时工作。
(of a worker)employed on a temporary or irregular basis
（工人）临时（或不定期）聘用的
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casual staff .临时工作人员。
(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。
[attrib.]happening by chance; accidental
偶然的；意外的
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he pretended it was a casual meeting .他假装那是次意外相见。
without formality of style, manner, or procedure, in particular
（风格、方式或步骤）非正式的，尤指：
(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。
(of a social event)not characterized by particular social conventions
（社会事件）不拘礼节的。
(of a place or environment)relaxed and friendly
（地方，环境）轻松而友好的
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the inn's casual atmosphere .这个旅馆的轻松友好的气氛。
a person who does something irregularly
偶尔做某事的人
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a number of casuals became regular customers .许多不固定的顾客成了定期客户。
a worker employed on an irregular or temporary basis
临时工。
〈史〉 济贫院短期居住者。
(casuals)clothes or shoes suitable for everyday wear rather than formal occasions
便服，便装，便鞋。
〈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）。
"late Middle English （in senses 2 and 3 of the adjective）： from Old French
