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Adjective: unmindful  ,ún'mInd-ful
  1. (followed by 'to' or 'of') lacking conscious awareness of
    "not unmindful of the heavy responsibility";
    - oblivious
  2. Not mindful or attentive
    "while thus unmindful of his steps he stumbled";
    - forgetful, mindless

See also: amnesiac, amnesic, heedfulness, incognisant [Brit], incognizant, mindfulness, unaware