Redoubtable – evoking fear; fearsome; formidable; commanding respect or reverence

“Most of the nation’s fleet was in the Pacific, and it was a formidable force under the command of the redoubtable Admiral George Dewey.”

Lion in the White House, Aida D. Donald

(Yes, the “T” is pronounced in Redoubtable, but not the “B”. I wasn’t entirely sure when I read the word, so I wanted to let you know as well.)