The word "unvary" means the absence of change or variation. The antonyms for this word are numerous, and they indicate a range of ideas that differing from an unchanged state. Some of the antonyms for "unvary" are shift, fluctuate, vary, mutate, transform, diversify, and evolve. These words suggest an alteration, modification, or transformation of a state, situation, or something else. They indicate the presence of change, difference or variation in a myriad of ways. For example, "shift" suggests a slight change, whereas "mutate" suggests a more radical and fundamental alteration. These antonyms allow us to express a multitude of meanings by indicating the presence of change rather than its absence.