Rigidifying, which means to make stiff or rigid, has several antonyms that signify the opposite of this action. Some of these antonyms include loosening, relaxing, softening, yielding, and flexing. When one rigidifies something, they create resistance and limit its flexibility. However, by using these antonyms, one can create a more pliable form that is resistant to breaking or becoming stiff. Loosening can be done by reducing the tension on a material or surface to prevent it from becoming brittle. Softening, on the other hand, can be achieved by adding moisture or heat to an object. Yielding, too, can offer flexibility much like flexing, which enhances muscle movement.