unnerving

1. Inspiring fear (synset 300196975)
   "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"
   similar to: alarming - frightening because of an awareness of danger
   same as: formidable, redoubtable

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