Source : Webster's Revised Unabridged Dictionary (1913)

Malevolent \Ma*lev"o*lent\, a. [L. malevolens, -entis; male ill
   + volens, p. pr. of velle to be willing or disposed, to wish.
   See {Malice}, and {Voluntary}.]
   Wishing evil; disposed to injure others; rejoicing in
   another's misfortune.

   Syn: Ill-disposed; envious; mischievous; evil-minded;
        spiteful; malicious; malignant; rancorous.

Source : WordNet®

malevolent
     adj 1: wishing or appearing to wish evil to others; arising from
            intense ill will or hatred; "a gossipy malevolent old
            woman"; "failure made him malevolent toward those who
            were successful" [syn: {malicious}] [ant: {benevolent}]
     2: extremely malevolent or malicious; "the malignant tongues of
        gossipers" [syn: {malignant}]
     3: having or exerting a malignant influence; "malevolent
        stars"; "a malefic force" [syn: {malefic}, {malign}, {evil}]