Malefic

from WordNet (r) 3.0 (2006)

malefic
    adj 1: having or exerting a malignant influence; "malevolent
           stars"; "a malefic force" [syn: {malefic}, {malevolent},
           {malign}, {evil}]

from The Collaborative International Dictionary of English v.0.48

Malefic \Ma*lef"ic\, a. [L. maleficus: cf. F. mal['e]fique. See
   {Malefaction}.]
   Doing mischief; causing harm or evil; nefarious; hurtful.
   [R.] --Chaucer.
   [1913 Webster]