Functional, efficient, effective, working, operative, productive, useful, viable, profitable, fruitful, thriving, beneficial, successful, advantageous, prosperous, and valuable are all antonyms for the word Nonfunctional. Nonfunctional means something that is not capable of performing its intended function or purpose. It is an adjective used to describe something that is not working, broken, or not able to operate as expected. On the other hand, antonyms for Nonfunctional are words that mean the opposite. These antonyms indicate that something is operational, beneficial, valuable, or profitable, making it an essential component of what constitutes functionality. Therefore, these words provide meaning and functionality to life and objects.