(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
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)