Showing extreme cupidity; painfully desirous of another's advantages "he was never covetous before he met her"; "jealous of his success and covetous of his possessions" - envious, jealous
Immoderately desirous of acquiring e.g. wealth "casting covetous eyes on his neighbour's fields" - avaricious, grabby [N. Amer], grasping, greedy, prehensile
See also: acquisitive, covetousness, desirous, wishful