accessless
adj. C2 Proficiency ac·cess·less
adj. having no way to get in or out. It describes a place that is completely closed off or impossible to reach.
adj. lacking any means of entry or exit; completely inaccessible. Often used in literary or technical contexts to describe physical or metaphorical barriers.
The old tower is accessless to the public.
The hikers found themselves in an accessless valley after the heavy rains washed away the only bridge.
The protagonist's journey into the accessless heart of the forest serves as a metaphor for the psychological barriers he must overcome to find peace.