Out-matches refers to a situation where one person, team, or thing proves to be better, superior, or stronger than another. Antonyms for the word "out-matches" include "inferior," "weaker," "outclassed," "defeated," "underdog," and "outdone." When someone is undermatched, they are considered to be less skilled, proficient, or capable than their opponent. Meanwhile, the term "outdone" indicates that someone has been surpassed or outperformed by another person or team. In short, antonyms for "out-matches" are words that describe a situation where someone or something is deemed less competent, less powerful, or less successful than their counterpart.