However, you can use prefixes to create words with similar meanings:
* De-: This prefix can imply removal or reversal. You could use it to create "de-unpleasant" for a word meaning "not unpleasant" or "pleasant."
* En-: This prefix can imply adding or intensifying. You could use it to create "en-joyable" for a word meaning "very enjoyable."
* Super-: This prefix implies something exceeding normal or typical. You could use it to create "super-delightful" for a word meaning "extremely delightful."
Ultimately, the best way to describe something as delightful is to use the word itself!