hatred: active hostility and ill will toward another, the settled opposite of love
Hatred names the strong, active dislike one person holds against another, and the Old Testament almost always sets it directly against love as its opposite. It is the noun form of the verb "to hate" (שָׂנֵא), naming the emotion itself rather than the act of hating.
The word covers a wide field. It can be quiet malice that a person hides behind smooth words, the kind Proverbs keeps warning about. It can be open enmity, close to a standing feud (אֵיבָה), fierce enough to drive violence, as when hatred turns a shove into murder, or when Amnon's craving for Tamar curdles into a loathing greater than the desire he had felt for her. Israel even flung the word at God, accusing him of rescuing them out of hatred rather than love.
Because it is the flat opposite of love, hatred often appears in paired sayings that weigh the two against each other: a simple meal shared in love against a lavish one soured by hatred, or a future in which no one can tell in advance whether love or hatred lies ahead. In a few places it is turned toward evil itself, as when the psalmist claims to hate God's enemies with a whole and complete hatred.