The passion opposed to love, aversion for a thing, for a person, or for his actions or qualities.
It is justifiable to hate or loathe the evil deeds or habits of another, as this can be done without hating the person.
It is never permitted to hate another with hostile sentiment or action, wishing him ill, rejoicing over his sufferings, injuring him in any way no matter how abominable his deeds or qualities may be.
Hatred for things appears chiefly in what is known as odium theologicum, the hatred of a religion or of those who profess it.
New Catholic Dictionary