oblivious
unconscious
unmindful
unsuspecting
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
out of it
unaware
unaware of
unconscious of
unhearing
uninsightful
unknowing
unmindful of
unperceiving
unprehensive
unrealizing
unseeing
unwitting
witless