Definitions

1. verb

past participle of run, especially in the phrase ‘unrunnable’ to indicate something is impossible to run.

“The trail was so rough that some parts were unrunnable for even the most experienced hikers.”

2. adjective

not able to be run or traveled over, especially because of being impassable due to mud or snow.

“The farmer warned us not to try to drive our car down the unrunnable road after the heavy snowfall.”