Incapable of being passed.

synonym: impassable.

Roget 261: closed etc. v.; shut, operculated^†; unopened.    unpierced^†, imporous^†, caecal [Med.]; closable; imperforate, impervious, impermeable; impenetrable; impassable, unpassable^†; invious^†; pathless, wayless^†; untrodden, untrod.    unventilated; air tight, water tight; hermetically sealed; tight, snug.    ... show more

Dutch: onbegaanbaar