redoubtable

Adjective

• worthy of respect or honor
  • born of a redoubtable family
    

• 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
    

Related words

• Synonyms: 
  formidable , unnerving