Etymology
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oblivious (adj.)

mid-15c., "forgetful, disposed to forget, heedless," from Latin obliviosus "forgetful, that easily forgets; producing forgetfulness," from oblivio "forgetfulness, a being forgotten"(see oblivion). Meaning "unaware, unconscious (of something)" is by 1862; it formerly was regarded as erroneous, but this is now the main meaning and the word has lost its original sense of "no longer aware or mindful." Properly it should be used with to, not of. Related: Obliviously; obliviousness.

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Definitions of oblivious

oblivious (adj.)
(followed by `to' or `of') lacking conscious awareness of;
oblivious to the risks she ran
oblivious of the mounting pressures for political reform
Synonyms: unmindful
oblivious (adj.)
failing to keep in mind;
oblivious old age
Synonyms: forgetful
From wordnet.princeton.edu