Metamorphosis is a Greek word that means to change, primarily in character or form. The term is used figuratively to reference a substantial transformation, like the process of a caterpillar becoming a butterfly. When we think of antonyms for metamorphosis, the first phrases that come to mind often reflect stasis, sameness, and rigidity. A few antonyms for metamorphosis might include invariance, permanence, fixity, and stability. Although the concept of "opposite" is not always entirely clear-cut, these words convey an enduring nature or inability to change that broadly contrasts with the transformative connotation of metamorphosis.