He lapsed into long silences or became offensively off-hand.

他要么陷入长时间的沉默，要么变得简慢无礼。

Consumers found the attitude of its staff offhand and generally offensive to the paying customer.

消费者认为其职员的态度漫不经心，对付款的顾客通常表现得令人反感。

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

“你们修理了吗？”—“一时说不清楚，但是我想还没有。”

'Were they at home or away, do you know offhand?'

“他们在家还是出去了，你能现在告诉我吗？”