Magic

After Kryptonite, the next most well-known way that Superman can be defeated is definitely by magical means.

Contrary to common opinion, Superman is not specifically weak to magic any more than you or I are specifically weak to being punched, but the fact is that he is no more resistant to it than the average person – and there’s a big difference between the two.

Magic has been used to harm Superman in various ways – both physically and mentally. Characters who are physically empowered by magic seem to have a slight edge over him, in spite of their strength being similar to his, while magical blasts have hurt him, but in terms of magic being used against the Man of Steel without touching the him, he has been mind-controlled by it several times, contained by it several times and much more.

A great example of a character who has proven able to best the Kryptonian with non-physical magic would be Arion, the Atlantean sorcerer who immobilised him and mind-controlled him using a spell. Another example of someone who could defeat him is Zatanna, who could, for example, say “peels” (“sleep” backwards) to put him to sleep.