The word "un-pliablest" means inflexible or rigid. Its antonyms are words that denote flexibility or pliability. Some of the antonyms of "un-pliablest" include adaptable, malleable, pliant, supple, yielding, limber, flexible, and elastic. These words refer to materials or people that can be changed or shaped, easily bend, or adjust to new or different situations. For example, a pliant metal can be bent and shaped without breaking or cracking, and a flexible employee can adapt to new tasks or work around obstacles without difficulty. The opposite of being un-pliablest is being able to adjust and adapt to changing circumstances with ease.