offhand
adverb
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in a casually inconsiderate manner“I replied in an offhand tone when my mother asked me if I had already made my bed.”offhandedoffhandedly
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without previous thought or preparation“couldn't give the figures offhand”offhanded
adjective
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casually thoughtless or inconsiderate“an offhand manner”offhanded
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with little or no preparation or forethoughtimpromptu