What it means

1. adjective casually thoughtless or inconsiderate
   “an offhand manner”
2. adjective with little or no preparation or forethought
   “his ad-lib comments showed poor judgment”
3. adverb in a casually inconsiderate manner
   “replied offhand, his mind a million miles away”
4. adverb without previous thought or preparation
   “couldn't give the figures offhand”