The term "outback" typically refers to remote or rural areas of Australia with a harsh and rugged environment. Some synonyms for "more outback" could include "further bush", "deeper wilderness", or "more remote hinterland". Other possible phrases might include "more rugged landscape", "more isolated terrain", or "more desolate environments". Essentially, any term that implies a more extreme, harsh, or remote environment could serve as a synonym for "more outback". Whether you're exploring the outback or simply using these synonyms to describe a difficult situation or environment, they can help convey a sense of toughness, resilience, and endurance.