careless
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(a) 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
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(s) effortless and unstudied
- an impression of careless elegance
- danced with careless grace
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(s) (usually followed by "of") without due thought or consideration
- careless of the consequences
- crushing the blooms with regardless tread