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Adjective: incognisant
Usage: Brit (N. Amer: incognizant)
  1. (often followed by ‘of’) not aware
    "seemed incognisant of the scrutiny";
    - unaware, incognizant

See also: asleep, awareness, cognisance [Brit], cognizance, consciousness, insensible, knowingness, oblivious, out of it, out of touch, sleeping, unconscious, unmindful, unsuspecting, unwitting