a. [ F. redoutable, formerly also spelt redoubtable. ] Formidable; dread; terrible to foes; as, a redoubtable hero; hence, valiant; -- often in contempt or burlesque. [ Written also redoutable. ] [ 1913 Webster ]
(adj) inspiring fear; ; - G.H.Johnston, Syn. unnerving, redoubtable, Example:the formidable prospect of major surgery; a tougher and more redoubtable adversary than the heel-clicking, jackbooted fanatic; something unnerving and prisonlike about high grey wall