1. A path, trail, or route that is unfamiliar or unknown; a journey into the unexplored or mysterious
They ventured down an unknown path in the forest.
Eles se aventuraram por um caminho desconhecido na floresta.
2. A figurative expression representing an uncertain or unpredictable future course of action
Taking this new job means walking down an unknown path.
Aceitar este novo emprego significa trilhar um caminho desconhecido.