likely to cause foundering; miry; swampy.
Origin of founderous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for founderous
Historical Examples of founderous
I have travelled through the negotiation,—and a sad, founderous road it is.
The road rose steeply; it was loose and founderous from heavy rain; great stones lay about, dangerous traps for a careless rider.Sophy of Kravonia