Definitions for unnavigable
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Random House Webster's College Dictionary
un•nav′i•ga•ble(adj.)
Princeton's WordNet
unnavigable(adj)
incapable of being navigated
Wiktionary
unnavigable(Adjective)
not navigable; impossible to sail through
unnavigable(Adjective)
that cannot be used for any reason.
The trail was unnavigable since the flood washed it away.
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