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Adjective: careless  kehr-lus
  1. Effortless and unstudied
    "an impression of careless elegance"; "danced with careless grace"
  2. (usually followed by 'of') without due thought or consideration
    "careless of the consequences";
    - regardless
  3. Marked by lack of attention, consideration, forethought or thoroughness; not careful
    "forgotten by some careless person"; "a careless housekeeper"; "careless proofreading"; "it was a careless mistake"; "hurt by a careless remark"; "careless about her clothes";
    - cavalier

See also: artless, carefulness, casual, cursory, haphazard, heedless, imprudent, inattentive, incautious, negligent, offhand, offhanded, passing, perfunctory, reckless, slapdash, slipshod, sloppy, superficial, unconcerned, unheeding

Antonym: careful

Encyclopedia: Careless