Wiktionary
unperceiving
a. Not perceive; devoid of perception.
WordNet
unperceiving
adj. lacking perception; "as unperceptive as a boulder" [syn: unperceptive] [ant: perceptive]
Usage examples of "unperceiving".
Thorley Rushworth play toward a fond and unperceiving husband: a smiling, bantering, humouring, watchful and incessant lie.
She was of Igwarl's age, looked his wiry double, had the same greenish-blond hair close-cropped, and bore before her like a sword at thrust a slender two-edged knife as she advanced inexorably upon the unperceiving boy.
I can't see how awareness of objects, of others, could arise: an unperceiving response.