redoubtable
adjective literary or humorous uk/rɪˈdaʊ.tə.bəl/ us/rɪˈdaʊ.t̬ə.bəl/
（尤指性格方面）强的；可敬的；令人敬畏的
very strong, especially in character; producing respect and a little fear in others
Tonight he faces the most redoubtable opponent of his boxing career. 今晚他面对的是他拳击生涯中最强大的对手。