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Webster 1913 Edition

Adj.

Difficult to travel; likely to trip one up;

as, a

founderous

road

[R.]

Burke.

Adj.

Failing; liable to perish; ruinous. [Not in use.]

founderous ‎(comparative more founderous, superlative most founderous)

(archaic) Difficult to travel; likely to trip one up.

a founderous road

(Can we find and add a quotation of Burke to this entry?)