evil

Moral badness; wickedness; malevolence; the forces or behaviors that are the opposite or enemy of good.

"Evil lacks spirituality, hence its need for mind control."

Something which impairs the happiness of a being or deprives a being of any good; something which causes suffering of any kind to sentient beings; harm; injury; mischief.

A malady or disease; especially in the phrase king's evil (scrofula).

Intending to harm; malevolent.

"an evil plot to brainwash and even kill innocent people"

Morally corrupt.

"Do you think that companies that engage in animal testing are evil?"

Unpleasant, foul (of odour, taste, mood, weather, etc.).