doughty Look up doughty at Dictionary.com
O.E. dohtig "competent, good, valiant," from dyhtig "strong," related to dugan "to be fit, be able, be strong," and influenced by its p.p., dohte. All from P.Gmc. *duhtiz- (cf. M.H.G. tühtec, Ger. tüchtig, M.Du. duchtich), from PIE *dheugh- "to be fit, be of use, proper" (cf. Ger. Tugend "virtue," Gk. teukhein "to make ready," Ir. dual "becoming, fit," Rus. duzij "strong, robust"). Rare after 17c.; in deliberately archaic or mock-heroic use since c.1800. If it had survived, its modern form would be dighty.