careless
     adj 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"
            [ant: {careful}]
     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" [syn: {careless(p)},
         {thoughtless(p)}, {regardless}]
     4: showing an unthinking lack of consideration; "a careless
        remark"
Source: WordNet® 2.0