随便：

casual 特指轻松随意、无忧无虑，不把任何事放在心上的;

random 特指无计划或目的地选择或发生的;

informal 友好随便的;非正规的;日常的;随便的；

扩展资料

　他对待什么事情都随随便便。

　He takes a casual attitude towards everything.

　这房间堆满了随便选择的家具。

　The room was filled with a random selection of furniture.

　服装的式样已经有了改变，以前很拘谨，现在较随便。

　There has been a shift in fashion from formal to more informal dress.