Off"hand` (?), a. Instant; ready; extemporaneous; as, an offhand speech; offhand excuses. -- adv. In an offhand manner; as, he replied offhand.

• without planning or thinking ahead
       
• She gave an offhand speech.
  
• careless, without proper thought or consideration
       
• He doesn't realise how hurtful his offhand remarks can be.
  
• curt, abrupt, unfriendly
       
• She was quite offhand with me yesterday.
  
• right away, immediately, without thinking about it
       
• Offhand, I'd guess that that's a yellow-bellied sapsucker.
       
• 1854: William Makepeace Thackeray, The Rose and the Ring - We will have no more of this shilly-shallying! Call the Archbishop, and let the Prince and Princess be married offhand!
  
• in an offhand manner