1. (adverb)offhand, offhanded, offhandedly without previous thought or preparation
"couldn't give the figures offhand"; "we decided offhand to go to Canada"; "she had made these remarks offhandedly"
2. (adverb)offhand, offhanded, offhandedly in a casually inconsiderate manner
"replied offhand, his mind a million miles away"; "she threw him over offhandedly without even a Dear-John letter"