[ im-pas-uh-buh l, -pah-suh- ]
/ ɪmˈpæs ə bəl, -ˈpɑ sə- /


not passable; not allowing passage over, through, along, etc.: Heavy snow made the roads impassable.
unable to be surmounted: an impassable obstacle to further negotiations.
(of currency) unable to be circulated: He tore the bill in half, making it impassable.

Origin of impassable

First recorded in 1560–70; im-2 + passable

Related forms

im·pass·a·bil·i·ty, im·pass·a·ble·ness, nounim·pass·a·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for impassable

British Dictionary definitions for impassable


/ (ɪmˈpɑːsəbəl) /


(of terrain, roads, etc) not able to be travelled through or over

Derived Forms

impassability or impassableness, nounimpassably, 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