An eephus pitch in baseball is a slow curveball thrown at an absurdly low speed, usually 60 miles per hour or less. Since it’s much slower than a typical baseball pitch, slower than even a knuckleball, it can catch a hitter off guard. However, if a major league hitter gets the timing right or the pitch doesn’t move like it should, it can be an easy pitch to hit.
The name eephus comes from a Hebrew word that means “nothing.” It’s a slow, junk pitch, something of a novelty, and generally better liked by fans and broadcasters than hitters.