The word "immalleable" refers to something that cannot be shaped or altered easily. Some antonyms for immalleable include malleable, pliable, and moldable, which all refer to something that is easily altered or shaped. Other antonyms include flexible, adaptable, and supple, which suggest a level of fluidity or ability to bend without breaking. Conversely, rigid, inflexible and unbending can also be considered antonyms of immalleable, indicating a complete lack of ability to change or adapt. Understanding the antonyms of immalleable can be useful in finding ways to alter or change something that may have previously seemed unchangeable.