1.Definition: (usually followed by `of') without due thought or consideration

"Careless of the consequences"

Related Adjective(s):regardless

2.Definition: effortless and unstudied

"An impression of careless elegance", "Danced with careless grace"

3.Definition: 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"