Definition of "unpassable" [un•pass•a•ble]

• Not able to be passed. (adjective)

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• "I walked around, passing him within maybe six inches because of the unpassable cacti and underbrush on both sides of the trail."
• "In fact, he was one of Satan's minions, disguised as a bumbling idiot, tempting me with the sweet nectar of life in the form of an unpassable deal."
• "They set fire to bramble, seedlings, and fallen twigs, lest this underbrush “overgrow the Country, making it unpassable,” in the words of a contemporary traveler, William Wood."