1. (adj) ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
with little or no preparation or forethought
Synonyms: unwritten, unrehearsed, ad-lib, off-the-cuff, extemporaneous, extempore, offhand, spontaneous, extemporary, impromptu, offhanded
Antonyms: prepared, careful
2. (adverb) offhand, offhanded
casually thoughtless or inconsiderate
Synonyms: unrehearsed, ad-lib, off-the-cuff, extemporaneous, extempore, offhand, extemporary, impromptu, offhanded
Antonyms: careful, prepared
3. (adverb) offhand, offhanded, offhandedly
without previous thought or preparation
Synonyms: offhandedly, offhand, offhanded
Antonyms: prepared, careful
4. (adverb) offhand, offhanded, offhandedly
in a casually inconsiderate manner
Synonyms: offhandedly, offhand, offhanded
Antonyms: prepared, careful
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Synonyms and Antonyms of offhand 
