Etymology
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careless (adj.)

Old English carleas "free from anxiety; unconcerned," from care (n.) + -less; a compound probably from Proto-Germanic (compare Old Norse kærulauss "quit, free"). Original senses extinct by mid-17c. (now in care-free); main modern meaning "not paying attention, inattentive, not taking due care" is attested by 1560s (in carelessly). Meaning "done or said without care, unconsidered" is from 1650s.

updated on November 01, 2017

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Definitions of careless from WordNet

careless (adj.)
(usually followed by `of') without due thought or consideration;
careless of the consequences
Synonyms: regardless
careless (adj.)
marked by lack of attention or consideration or forethought or thoroughness; not careful;
a careless housekeeper
it was a careless mistake
forgotten by some careless person
hurt by a careless remark
careless proofreading
careless about her clothes
careless (adj.)
effortless and unstudied;
an impression of careless elegance
danced with careless grace
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.