"covetously" in the adverb sense
1. enviously, covetously, jealously
with jealousy in an envious manner
"he looked at his friend's new car jealously"
2. avariciously, covetously, greedily
in a greedy manner
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License