Adjective
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(usually followed by `of') without due thought or consideration
"careless of the consequences"
"crushing the blooms with regardless tread"
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effortless and unstudied
"an impression of careless elegance"
"danced with careless grace"
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marked by lack of attention or consideration or forethought or thoroughness
not careful
"careless about her clothes"
"forgotten by some careless person"
"a careless housekeeper"
"careless proofreading"
"it was a careless mistake"
"hurt by a careless remark"