WordNet sense 1 (showing extreme cupidity; painfully desirous of another's advantages):

covetous

WordNet sense 2 ((often followed by `for') ardently or excessively desirous):

avid, greedy

WordNet sense 3 ((usually followed by `for') extremely desirous):

hungry, thirsty

WordNet sense 4 (having or expressing desire for something):

wishful