1. A path or route that is not officially designated, marked, or clearly defined; an off-the-beaten-path route
We decided to take an unmarked path through the forest to reach the waterfall.
Decidimos seguir um caminho sem marcar pela floresta para chegar à cachoeira.
2. Figuratively, an unconventional or uncharted approach to solving a problem or achieving a goal
He chose to forge an unmarked path in his career rather than follow tradition.
Ele escolheu um caminho sem marcar em sua carreira em vez de seguir a tradição.