unnerving

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

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
• Syn:
formidable, redoubtable
• Similar to:
alarming