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Adjective: oblivious  u'bli-vee-us
  1. (followed by 'to' or 'of') lacking conscious awareness of
    "oblivious of the mounting pressures for political reform";
    - unmindful
  2. Failing to keep in mind
    "oblivious old age";
    - forgetful

See also: inattentive, incognisant [Brit], incognizant, unattentive [rare], unaware

Encyclopedia: Oblivious