We found one dictionary that defines the word unwalkability:

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1. unwalkability: Wiktionary

Definitions from Wiktionary (unwalkability) ▸ noun:  The quality of being unwalkable. ▸ Words similar to unwalkability ▸ Usage examples for unwalkability ▸ Idioms related to unwalkability ▸ Wikipedia articles (New!) ▸ Popular adjectives describing unwalkability ▸ Words that often appear near unwalkability ▸ Rhymes of unwalkability ▸ Invented words related to unwalkability