Pliantness refers to the quality of being supple, bendable or adaptable. Some antonyms for pliantness include rigidity, stiffness, inflexibility, and inelasticity. Rigidity refers to the inability to bend or yield to pressure, making it the opposite of pliantness. Stiffness denotes resistance to bending, usually due to being unyielding or inflexible. Inflexibility is the inability to change or adapt to new situations, opposite of pliantness which is adaptable. Lastly, inelasticity refers to a lack of elasticity, usually due to being inflexible, so it is contrary to pliantness that denotes a high level of elasticity or flexibility.