Source : Webster's Revised Unabridged Dictionary (1913)

Mindless \Mind"less\, a.
   1. Not indued with mind or intellectual powers; stupid;
      unthinking.

   2. Unmindful; inattentive; heedless; careless.

            Cursed Athens, mindless of thy worth. --Shak.

Source : WordNet®

mindless
     adj 1: lacking the thinking capacity characteristic of a conscious
            being; "the shrieking of the mindless wind"
     2: requiring little mental effort; "mindless tasks"
     3: not mindful or attentive; "while thus unmindful of his steps
        he stumbled"- G.B.Shaw [syn: {unmindful}, {forgetful}]
        [ant: {mindful}]
     4: complacently or inanely foolish [syn: {asinine}, {fatuous},
        {inane}, {vacuous}]
     5: not marked by the use of reason; "mindless violence";
        "reasonless hostility"; "a senseless act" [syn: {reasonless},
         {senseless}]