The Collaborative International Dictionary of English v.0.48:

Unaware \Un`a*ware"\, a.
   Not aware; not noticing; giving no heed; thoughtless;
   inattentive. --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unaware \Un`a*ware"\, adv.
   Unawares. [Poetic] --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unaware
    adj 1: (often followed by `of') not aware; "seemed unaware of
           the scrutiny"; "unaware of the danger they were in";
           "unaware of the newborn hope"; "the most unaware person
           I've known" [syn: unaware, incognizant] [ant:
           aware(p), cognisant, cognizant]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "unaware":
   a stranger to, aback, asleep, blind to, caught napping, dead to,
   deaf to, heedless, ignorant, impercipient, in ignorance of,
   incognizant, inexpectant, inobservant, insensible, insensible to,
   lost to, mindless, napping, nonconceiving, nonexpectant,
   not with it, oblivious, out of it, short, sudden, suddenly,
   unacquainted, unadmonished, unadvised, unanticipatedly,
   unanticipating, unanticipative, unaware of, unconscious,
   unconscious of, unenlightened, unexpectedly, unexpecting,
   unfamiliar, unforewarned, unguessing, unhearing, uninformed,
   uninsightful, uninstructed, unknowing, unmindful, unmindful of,
   unperceiving, unprehensive, unprepared, unready, unrealizing,
   unseeing, unsuspecting, unwarned, unwitting, witless