Most redoubted is a term used to describe someone or something that is widely feared or revered. The opposite of this phrase would be something or someone that is unknown, unremarkable or unimpressive. Antonyms for most redoubted could include words like ordinary, common, unexceptional, unimportant, or insignificant. These words describe things or people that do not have enough impact to be widely recognized or feared. It's important to note that antonyms for most redoubted would depend greatly on the context and use of the phrase. In some situations, words like unimpressive or ordinary could still cause fear or reverence if used effectively.