The word unamenable means resistant, stubborn, or unyielding. Hence, the antonyms for the word most unamenable would be those that indicate flexibility, cooperation, and willingness to adapt. Some of the antonyms for unamenable are pliable, flexible, compliant, adaptable, amenable, and docile. These words signify a person or thing that is easily manageable, responsive, and open to change or suggestions. An individual or a group that is most unamenable can be challenging to deal with and may cause difficulties, whereas people or things that are amenable make it much easier to work with and achieve desired outcomes. Therefore, it's always better to be amenable and cooperative rather than being unamenable and challenging.