offhandedly

Adverb (2)

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