Formidable; dread; terrible to foes; as, a redoubtable hero; hence, valiant; -- often in contempt or burlesque.

giving rise to awe; formidable and seemingly insuperable

inspiring fear; "the formidable prospect of major surgery"; "a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic"- G.H.Johnston; "something unnerving and prisonlike about high gray wall"

having or worthy of pride; "redoubtable scholar of the Renaissance"; "born of a redoubtable family"