Being oblivious to something means being unaware of it or not noticing it. There are several other words and phrases that can be used to convey a similar meaning. These include being oblivious to something, being unaware of something, being ignorant of something, being blind to something, and being clueless about something. Other synonyms for being oblivious to something could include not having a clue about something, being unenlightened about something, being in the dark about something, and not being cognizant of something. Regardless of the phrase used, it suggests that the person is lacking knowledge or understanding about a particular topic or situation.