offhand

The waiter's offhand manner made the customers feel like they were not welcome.

(Chinese) 服务员那副漫不经心的态度让顾客觉得他们不受欢迎。

I can't remember the exact date offhand, but I think the meeting is next Tuesday.

(Chinese) 我随口记不起确切日期，但我想会议是在下周二。