"parasitical" in the adjective sense
1. parasitic, parasitical
relating to or caused by parasites
"parasitic infection"
2. parasitic, parasitical, leechlike, bloodsucking
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"
Source: WordNet® (An amazing lexical database of English)
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