The word "motilities" refers to the ability or capacity to move. Its antonyms are words that describe the opposite of movement, such as immobility, stillness, stiffness, rigidity, or paralysis. Immobility means the absence of movement or the inability to move. Stillness refers to the absence of sound, motion, or disturbance. Stiffness means the rigidity of a body or muscle that hinders movement. Rigidity refers to the inability to bend or be flexible. Paralysis means the loss of movement or function of a body part or the entire body. All these antonyms describe the opposite of motilities and convey the idea of stagnant or static conditions.