Antonyms for the phrase "most decreased" would include words such as increased, grown, enlarged, augmented, developed, expanded, and elevated. These words denote a sense of growth, improvement, and progress, as opposed to a decrease or decline. In various contexts, the antonyms for "most decreased" would vary. For instance, if referring to financial terms, antonyms might include "profits," "gains," or "earnings." Whereas, in reference to health or fitness, antonyms could include words such as "improved," "strengthened," or "recovered." Nonetheless, antonyms serve an essential purpose of widening our language knowledge and how we describe the world around us.