Abatable is an adjective used to describe something that can be reduced or diminished. The opposite of abatable is inabatable which means something that is not capable of being reduced or diminished. Another antonym of abatable is unchangeable which refers to something that cannot be altered, modified, or adjusted. Other antonyms of abatable include immovable, fixed, static, and unalterable. These words convey the idea of something that is permanent, unchangeable, or impenetrable. In contrast, abatable represents something that is flexible, adjustable, and temporary. Therefore, the antonyms of abatable are designated to describe the opposite of these qualities.