General desirability:
* Attractive
* Appealing
* Pleasing
* Delightful
* Enticing
* Alluring
* Charming
* Favorable
* Beneficial
* Advantageous
* Worthy
Desirability based on value:
* Valuable
* Precious
* Worthwhile
* Profitable
* Lucrative
* Commendable
Desirability based on desirability:
* Sought-after
* In demand
* Popular
* Highly regarded
* In vogue
* Trendy
Desirability based on need or want:
* Needed
* Essential
* Crucial
* Desired
* Yearned for
* Longed for
Desirability based on quality:
* Excellent
* Exceptional
* Outstanding
* Superior
* First-rate
* Top-notch
More formal synonyms:
* Meritorious
* Admirable
* Excellent
* Suitable
The best synonym to use will depend on the specific context. Consider what aspects of desirability you want to emphasize.