Is it farther or further?


[nav-i-guh-buh l] /ˈnæv ɪ gə bəl/
deep and wide enough to provide passage to ships:
a navigable channel.
capable of being steered or guided, as a ship, aircraft, or missile.
1520-30; < Latin nāvigābilis, equivalent to nāvigā(re) to sail (see navigate) + -bilis -ble
Related forms
navigability, navigableness, noun
navigably, adverb
nonnavigability, noun
nonnavigable, adjective
nonnavigableness, noun
nonnavigably, adverb
unnavigability, noun
unnavigable, adjective
unnavigableness, noun
unnavigably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for unnavigable
  • Without an atmosphere to transmit heat or sound, each patch of the moon is an island in an unnavigable sea.
  • Large snowfall totals are uncommon, but the parks do experience snow, which can make roads and trails unnavigable.
  • Signs are incomprehensible, and traffic is often unnavigable.
  • Early prospectors and explorers declared the whitewater unnavigable, and forged an eastward detour around it.
  • His ship is completely unnavigable, the artillery could not work, and the saws would never have any useful purpose.
  • The raft or logjams were extensive, causing the river to be unnavigable.
  • At flood stage, on the other hand, the river was unnavigable because of its high velocity.
  • The sometimes unnavigable conditions diverted a significant amount of traffic away from the route.
British Dictionary definitions for unnavigable


wide, deep, or safe enough to be sailed on or through: a navigable channel
capable of being steered or controlled: a navigable raft
Derived Forms
navigability, navigableness, noun
navigably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unnavigable



mid-15c., from Old French navigable (14c.) or directly from Latin navigabilis, from navigat-, past participle stem of navigare (see navigation). Related: Navigability.

Online Etymology Dictionary, © 2010 Douglas Harper
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