ob·liv·i·ous əˈblivēəs/ adjective not aware of or not concerned about what is happening around one. that's all they ever were, oblivious. oblivious about one another's infatuation with each other. emerald was oblivious to the fact that her best friends boyfriend, harry, was meant to be hers. harry was oblivious to the fact that his girlfriend was not supposed to be lucy, but emerald.