oblivious
🇺🇸
/əˈblɪviəs/
🇬🇧
/əˈblɪviəs/
completely unaware or not noticing something
He was so engrossed in his book that he was oblivious to the noise around him.
彼はその本にそんなに夢中になっていたので、周りの騒音に気づかなかった。