Most hundredproof is a term used to describe something that is strong, potent, and resistant to weakening. Its antonyms would, therefore, be words that describe something weak, mild, or diluted. Some possible antonyms for most hundredproof are watered-down, diluted, weak, diluted, insipid, bland, flat, feeble, flimsy, timid, unexciting, and unsatisfying. These words denote qualities that are entirely opposite of the original term's strength and intensity, presenting a sharp contrast in meaning. Understanding antonyms helps to broaden your vocabulary and reinforces the importance of context in interpreting language.