Sclerotic refers to something that is stiff, rigid, or unyielding. Therefore, antonyms for this word would describe things that are flexible, pliable or adaptable. Words that come to mind are supple, agile, elastic, lithe, and pliant. Synonyms for the opposite of sclerotic could also include nimble, resilient, and mobile. Such terms describe entities that are capable of adjusting or modifying themselves in accordance with changing circumstances, rather than being static or unchanging. In summary, the antonyms for "more sclerotic" capture the qualities of flexibility, dynamism, motion, adaptation, and malleability.