covetous
adjective formal disapproving uk/ˈkʌv.ɪ.təs/ us/ˈkʌv.ə.t̬əs/
（尤指对属于别人的东西）贪求的，垂涎的
wanting to have something too much, especially something that belongs to someone else
I can't help casting covetous looks at my neighbour's new Porsche. 我忍不住对邻居的新保时捷车垂涎欲滴。