Who is the 1944 DC comic supervillain character from Superman, who torments and tricks the hero and can only be defeated by getting him to say his own name backwards?

His only weaknesses are that he cannot stand being ridiculed and if he says or spells his name backwards, Klptzyxm (kil-pit-ZEE-zim /k?lp?t'zi?z?m/), he is involuntarily sent back to his home dimension for a minimum of 90 days.