WordWeb Online

1. (often followed by 'of') not aware
   "unaware of the danger they were in"; "the most unaware person I've known"; "seemed unaware of the scrutiny";
   - incognizant, incognisant [Brit]

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

Antonym: aware

Encyclopedia: Unaware