Definition of "redoubtable" [re•doubt•a•ble]

• Arousing fear or awe; formidable. (adjective)
• Worthy of respect or honor. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "General Byng's attack covered the whole length of what had become known as the redoubtable and supposedly impregnable "Hindenburg line," so called because it had been established by that greatest of all German military geniuses, Field Marshal von Hindenburg."
• "Lucien watched this Dauriat, who addressed Finot with the familiar tu, which even Finot did not permit himself to use in reply; who called the redoubtable Blondet “my boy,” and extended a hand royally to Nathan with a friendly nod."
• "League and Covenant led him a prodigiously dull life and made him very weary with long sermons and grim Sundays, the Parliament called the redoubtable Oliver home to knock the Scottish men on the head for setting up that Prince."