bloodsucking \bloodsucking\ adj.

1. drawing blood from the body of another; as, a plague of bloodsucking insects. [WordNet 1.5]

2. having the nature or habits of a parasite or leech; living off another; -- of plants or persons; as, a bloodsucking blackmailer; bloodsucking lawyers.

Syn: parasitic, parasitical, leechlike. [WordNet 1.5 +PJC]

Source: The Collaborative International Dictionary of English v.0.48
 

bloodsucking adj
1: drawing blood from the body of another; "a plague of bloodsucking insects"
2: of plants or persons; having the nature or habits of a parasite or leech; living off another; "a wealthy class parasitic upon the labor of the masses"; "parasitic vines that strangle the trees"; "bloodsucking blackmailer"; "his indolent leechlike existence" [syn: parasitic, parasitical, leechlike]

Source: WordNet (r) 2.0