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Adjective: unnerving  ,ún'nur-ving
  1. Inspiring fear
    "something unnerving and prisonlike about high grey wall";
    - formidable, redoubtable, doubtable [archaic]
Verb: unnerve  ,ún'nurv
  1. Disturb the composure of
    "Good, it shouldn't unnerve him at all";
    - faze, enervate, unsettle, rattle [informal]

See also: alarming

Type of: discomfit, discompose, disconcert, untune [rare], upset