benevolent, a.
From Old French benivolent, benvolent, from Latin bene volent-em, from bene "well" + volent-em "wishing, willing," present participle of velle "to will, wish"
malevolent, a.
Classical Latin malevolent-, malevolens "ill-disposed, spiteful," from male "ill" (see MAL-) + volens "willing"
Funny how "well-wishing" and "ill-wishing" just don't have the same ring.