offhand

1. ADJ If you say that someone is being offhand, you are critical of them for being unfriendly or impolite, and not showing any interest in what other people are doing or saying. 不友好的; 不礼貌的; 漫不经心的[usu v-link ADJ] [表不满]

Consumers found the attitude of its staff offhand and generally offensive to the paying customer. 消费者认为职员态度漫不经心，通常冒犯来这些花了钱的顾客。

2. ADV If you say something offhand, you say it without checking the details or facts of it. 未经核实地[ADV after v]

"Have they done the repairs?"—"Can't say off-hand, but I doubt it."

“他们修过了吗？”——“我一时说不清，但我想还没有”。