Source : Webster's Revised Unabridged Dictionary (1913)

Heedless \Heed"less\, a.
   Without heed or care; inattentive; careless; thoughtless;
   unobservant.

         O, negligent and heedless discipline!    --Shak.

         The heedless lover does not know Whose eyes they are
         that wound him so.                       --Waller.
   -- {Heed"less*ly}, adv. -- {Heed"less*ness}, n.

Source : WordNet®

heedless
     adj 1: 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: {thoughtless},
             {unheeding}] [ant: {heedful}]
     2: characterized by careless unconcerned; "the heedless
        generosity and the spasmodic extravagance of persons used
        to large fortunes"- Edith Wharton; "reckless squandering
        of public funds" [syn: {reckless}]