redoubtable

1. 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 gray wall"

2. having or worthy of pride;

"redoubtable scholar of the Renaissance"

"born of a redoubtable family"