adj.漫不经心的,马虎的;随便的;偶然的;临时的;(服装)便装的;短期的;感情不深的;
n.便装;临时工;
例句:
He replied with a casual air.
他漫不经心地回答.
It was just a casual remark—I wasn't really serious.
我只是随便说说,并不当真。
He earns a living by casual labour.
他靠做临时工为生.