with little or no preparation or forethought
"his ad-lib comments showed poor judgment"
"an extemporaneous piano recital"
"an extemporary lecture"
"an extempore skit"
"an impromptu speech"
"offhand excuses"
"trying to sound offhanded and reassuring"
"an off-the-cuff toast"
"a few unrehearsed comments"
in a casual or curt style, without preparation or thought; Impromptu, offhand.
without previous thought or preparation
"couldn't give the figures offhand"
"we decided offhand to go to Canada"
"she had made these remarks 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"