Oblivious, a. — Webster enters it under “oblivious”
Etymology: [L.obliviosus: cf.F. oblivieux.]
1. Promoting oblivion; causing forgetfulness. "The oblivious pool." Milton. She lay in deep, oblivious slumber. Longfellow.
2. Evincing oblivion; forgetful. Through are both weak in body and oblivious. Latimer. -- Obliv"i*ous*ly, adv. -- Ob*liv"i*ous*ness, n. Foxe.
Shades of meaning
Fernald lists obliviousness only as an antonym, under memory.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given