The word "un-sufficient" means not enough or inadequate. Its antonyms are sufficient, ample, abundant, satisfactory, and plentiful. If something is sufficient, it means it is enough or suitable for a particular purpose. On the other hand, if something is abundant, then it means it is available in large quantities or plentiful. When something is considered satisfactory, it means it meets or surpasses expectations. Lastly, if something is plentiful, it means there is a lot of it available. Therefore, using antonyms for "un-sufficient" in a thorough manner can help people express their thoughts and feelings more effectively, and communicate ideas more clearly to others.