"offhand" in the adjective sense
1. ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
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"
2. offhand, offhanded
casually thoughtless or inconsiderate
"an offhand manner"
"she treated most men with offhand contempt"
"offhand" in the adverb sense
1. 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. 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"
Source: WordNet® (An amazing lexical database of English)
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