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unnavigable

adjective
un·navigable | \ "+ \

Definition of unnavigable 

: not navigable up rapid-broken, unnavigable streams —World's Work

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First Known Use of unnavigable

1578, in the meaning defined above

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Dictionary Entries near unnavigable

unnatural causes

unnaturalize

unnaturalized

unnavigable

unneat

unnecessaries

unnecessarily

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The first known use of unnavigable was in 1578

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