redoubtable
1. [ adjective ] inspiring fear
Synonyms: formidable unnerving
Examples:

"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 gray wall"

Related terms: alarming
2. [ adjective ] having or worthy of pride
Synonyms: glorious respected illustrious
Examples:

"redoubtable scholar of the Renaissance" "born of a redoubtable family"

Related terms: proud