Adjective
1. 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"2. effortless and unstudied;
"an impression of careless elegance""danced with careless grace"3. (usually followed by `of') without due thought or consideration;
"careless of the consequences""the proverbial grasshopper--thoughtless of tomorrow""crushing the blooms with regardless tread"4. showing an unthinking lack of consideration;
"a careless remark"