"prompted by malign motives"; "believed in witches and malign spirits"; "gave him a malign look"; "a malign lesion"
is similar to
like a cancer; an evil that grows and spreads
"remorse was cancerous within him"; "pornography is cancerous to the moral development of our children"
see also
harmful or evil in intent or effect
see also
causing or capable of causing harm
"too much sun is harmful to the skin"; "harmful effects of smoking"
see also
lacking kindness
"a thoughtless and unkind remark"; "the unkindest cut of all"
is an attribute of
quality of being disposed to evil; intense ill will