adj.
Impossible to pass, cross, or overcome: impassable roads; impassable problems.
impassability im·pass'a·bil'i·ty or im·pass'a·ble·ness n.
impassably im·pass'a·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
