Careless Definition
 kârlĭs 
    adjective
  
 
    carelessest
  
Without worry; carefree; untroubled.
 Webster's New World 
Taking insufficient care; negligent.
 A careless housekeeper; careless proofreading.
 American Heritage 
Marked by or resulting from lack of forethought or thoroughness.
 A careless mistake.
 American Heritage 
Not paying enough attention; not thinking before one acts or speaks; neglectful; heedless; inconsiderate.
 Webster's New World 
Done or made without enough attention, precision, etc.; not painstaking or thorough.
 Webster's New World 
Synonyms: 
  Other Word Forms of Careless
Adjective
Base Form:
 carelessSuperlative:
 carelessestIdioms, Phrasal Verbs Related to Careless
- careless of
Origin of Careless
-  From Middle English careles, from Old English carlēas (“careless, reckless, void of care, free from care, free”), equivalent to care + -less. From Wiktionary 
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