The term "incompatible" refers to situations or things that clash or cannot work together. Some antonyms of incompatible are harmonious, complementary, and compatible. Harmonious refers to things that are in agreement and work well with each other, while complementary refers to things that enhance or add to each other when combined. Compatible, on the other hand, describes things that can function together seamlessly without any disturbance or conflict. These antonyms are useful in differentiating between different types of relationships, be it personal or professional, and serve to enhance positive interactions between individuals or systems.