"Un pliabler" is a French word that means inflexible or rigid. As the opposite of the word "un pliabler," there are numerous antonyms that can be used to describe a person or an object that is adaptable or flexible. Some of the antonyms for "un pliabler" include flexible, pliable, bendable, supple, adaptable, and malleable. These words denote a quality of being able to adjust to different circumstances or situations. For example, a person who is flexible can easily adapt to changing conditions and is willing to compromise. Similarly, an object that is malleable can be reshaped or molded into different forms.