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casual
['kæʒəwəɫ]
an ability to interest casual students
showed a casual disregard for cold weather
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insouciant
[ˌɪ'nsusjənt]
an elegantly insouciant manner
an utterly insouciant financial policy
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nonchalant
[ˌnɑnʃə'ɫɑnt]
drove his car with nonchalant abandon
was polite in a teasing nonchalant manner