(a.) Not cognizant; failing to apprehended or notice.

a stranger to asleep blind to caught napping dead to deaf to impercipient in ignorance of insensible insensible to mindless napping nonconceiving not with it oblivious out of it unaware unaware of unconscious unconscious of unhearing uninsightful unknowing unmindful unmindful of unperceiving unprehensive unrealizing unseeing unsuspecting unwitting witless