9 letters · 14 points in Scrabble
adjective (followed by `to' or `of') lacking conscious awareness of
adjective failing to keep in mind
originFrom Middle English oblivious, from Latin oblīviōsus (“forgetful, oblivious”), formed from oblīvium (“forgetfulness, oblivion”) + -ōsus (“full of, overly, prone to”), from oblīvīscor (“to forget”).
Etymology from Wiktionary, CC BY-SA 3.0