thoughtless
     adj 1: showing lack of careful thought; "the debate turned into
            thoughtless bickering" [ant: {thoughtful}]
     2: marked by or paying little heed or attention; "We have
        always known that heedless self-interest was bad morals;
        we know now that it is bad economics"--Franklin D.
        Roosevelt; "heedless of danger"; "heedless of the child's
        crying" [syn: {heedless}, {unheeding}] [ant: {heedful}]
     3: without care or thought for others; "the thoughtless saying
        of a great princess on being informed that the people had
        no bread; `Let them eat cake'" [syn: {uncaring}, {unthinking}]
     4: (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}]
Source: WordNet® 2.0