a few unrehearsed comments.
an extemporaneous piano recital.
an extemporary lecture.
an extempore skit.
an impromptu speech.
an off-the-cuff toast.
an offhand manner.
couldn't give the figures offhand.
his ad-lib comments showed poor judgment.
offhand excuses.
replied offhand, his mind a million miles away.
she had made these remarks offhandedly.
she threw him over offhandedly without even a Dear-John letter.
she treated most men with offhand contempt.
trying to sound offhanded and reassuring.
we decided offhand to go to Canada.