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impassable

[im-pas-uh-buh l, -pah-suh-] /ɪmˈpæs ə bəl, -ˈpɑ sə-/
adjective
1.
not passable; not allowing passage over, through, along, etc.:
Heavy snow made the roads impassable.
2.
unable to be surmounted:
an impassable obstacle to further negotiations.
3.
(of currency) unable to be circulated:
He tore the bill in half, making it impassable.
Origin
1560-1570
1560-70; im-2 + passable
Related forms
impassability, impassableness, noun
impassably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for impassableness

impassable

/ɪmˈpɑːsəbəl/
adjective
1.
(of terrain, roads, etc) not able to be travelled through or over
Derived Forms
impassability, impassableness, noun
impassably, 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 impassableness

impassable

adj.

"that cannot be passed," 1560s, from im- + passable.

Online Etymology Dictionary, © 2010 Douglas Harper
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