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The Collaborative International Dictionary
Fortitudinous

Fortitudinous \For`ti*tu"di*nous\, a. Having fortitude; courageous. [R.]
--Gibbon.

Douglas Harper's Etymology Dictionary
fortitudinous

"capable of endurance," 1752, from Latin fortitudinem (nominative fortitudo) "strength, firmness" (see fortitude) + -ous. Related: Fortitudinously.

Wiktionary
fortitudinous

a. Having fortitude; courageous.