'Covetous' implies a negative and selfish desire, suggesting it's not admirable or virtuous. His covetous nature made him unpopular among his peers.
Pro Tip 2/3
Subtle Greed
Using 'covetous' indicates a hidden or secretive longing for what others have, not just open envy. He cast a covetous eye on her new phone, wishing it were his.
Pro Tip 3/3
Intensity of Desire
The word 'covetous' expresses a powerful desire, more intense than a casual wish or want. Her covetous longing for the lead role in the play was evident to everyone.