The word "de-lighting" does not have a commonly accepted antonym due to the fact that it is not a widely used word. However, one possible antonym could be "displeasing," which means causing unhappiness or dissatisfaction. Another antonym could be "disappointing," which means failing to live up to expectations. As "de-lighting" conveys a sense of great pleasure or satisfaction, its antonyms are words that convey a sense of dissatisfaction or unhappiness. Although it is not commonly used, the concept of "de-lighting" can be important as it can allow individuals to recognize the things that bring joy into their lives.