Word Origin & History
oblivion
1390, "state or fact of forgetting," from L. oblivionem (nom. oblivio) "forgetfulness," from oblivisci (pp. oblitus) "forget," originally "even out, smooth over," from ob "over" + root of levis "smooth." Oblivious is c.1450, from L. obliviosus "forgetful," from oblivio. It has lost its original sense of "no longer aware or mindful," however, and now means simply "unaware" (1862). Properly should be used with to, not of.