re·doubt·able 
/rɪˈdaʊtəbəl/ adjective
/rɪˈdaʊtəbəl/ adjective literary + formal : causing or deserving great fear or respect : very powerful, impressive, etc.
▪ a redoubtable [=formidable] warrior ▪ There is a new biography of the redoubtable Winston Churchill.
▪ a redoubtable [=formidable] warrior ▪ There is a new biography of the redoubtable Winston Churchill.
