1. (adj) unreflective, unthinking, unthoughtful
not exhibiting or characterized by careful thought
Synonyms: thoughtless, unthoughtful, lumpen, lumpish, uncaring, unreflective, unthinking
Antonyms: considerate, thoughtful, smart
2. (adj) thoughtless, uncaring, unthinking
without care or thought for others
Synonyms: unthinking, lumpen, unaffectionate, detached, lumpish, uncaring, unthoughtful, thoughtless, unreflective
Antonyms: considerate, thoughtful, smart
3. (adverb) lumpish, lumpen, unthinking
mentally sluggish
Synonyms: thoughtless, unthoughtful, lumpen, uncaring, lumpish, unreflective, unthinking
Antonyms: thoughtful, considerate, smart
4. (adverb) thoughtlessly, unthinkingly, unthinking
in a thoughtless manner
Synonyms: unthinkingly, thoughtlessly, unthinking
Antonyms: smart, considerate, thoughtful
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Synonyms and Antonyms of unthinking 
