casually

She'd mentioned it casually once, surprising him by her unconcern.

她随意地提过一次这个事，她的漠不关心让他吃惊。

Or perhaps someone will casually glance through your credit card purchases or cell phone bills to find out your shopping preferences or calling habits.

或者可能有人会随意浏览你的信用卡购物记录或手机账单，以了解你的购物偏好或通话习惯。

She works casually as a waiter.

她临时做着服务员。