The antonyms for "most expended" are "least expended," "minimum expended," "restricted" or "limited." When the term "most expended" is used it usually means that a significant amount of resources, energy, or effort were used. Conversely, using the antonyms would mean that only minimal resources, energy, or effort were used in a particular task or activity. These antonyms could be used in different contexts, such as in economics, where a company could opt for the least expended resources to minimize costs. Another instance could be in athletics, where an athlete can minimize their energy expenditure to conserve energy for the rest of the competition.