Synonyms of unnerving

Verb

1. faze, unnerve, enervate, unsettle, upset, discompose, untune, disconcert, discomfit

usage: disturb the composure of

Adjective

1. formidable, redoubtable, unnerving, alarming (vs. unalarming)

usage: 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"