(adv) without previous thought or preparation, Syn. offhanded, offhandedly, Example:couldn't give the figures offhand; we decided offhand to go to Canada; she had made these remarks offhandedly
(adv) in a casually inconsiderate manner, Syn. offhanded, offhandedly, Example:replied offhand, his mind a million miles away; she threw him over offhandedly without even a Dear-John letter
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Instant; unprepared; ready; extemporaneous; unrehearsed; as, an offhand speech; offhand excuses; an offhand comment. -- adv. In an offhand manner; as, he replied offhand. [ 1913 Webster ]