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