formidable redoubtable unnerving
formidable%5:00:00:alarming:00 redoubtable%5:00:00:alarming:00 unnerving%5:00:00:alarming:00
strašen
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 grey wall