形容詞 off hand:

1. with little or no preparation or forethought
   同義詞：ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
2. casually thoughtless or inconsiderate
   同義詞：offhand, offhanded

副詞 off hand:

1. without preparation
   同義詞：off-hand, ex tempore
2. without previous thought or preparation
   同義詞：offhand, offhanded, offhandedly
3. in a casually inconsiderate manner
   同義詞：offhand, offhanded, offhandedly

1. Being an expert, he was able to pick a hole in our work off hand.
   作為一名專家，他一下子就能挑出我們工作中的毛病。
2. I sent many letters today. Off hand, I should think15.
   今天我寄出許多信。大致地算，我想有15封吧。
3. I cannot give you a reply off hand.
   我不能立刻給你答復。
4. He can't say off hand.
   他不能馬上答復。