Knuckleball is a pitch wothout any spin.
A baseball thrown without spin is very difficult to hit because it will move randomly.
Yes, but it is not so much that it is difficult to hit…but it is very difficult to hit squarely. It is a pitch where you get lots of partial contact, which is to say weak contact, because while you can hit it, because of its random movement you jet get a small piece of it, you don’t square it up (unless you just get lucky or the conditions are such that the movement is diminished - then it’s like hitting a slow pitch softball)). And even when you square it up, all the strength and force is provided by you and none by the velocity of the pitch.
Yes. Very true.
My high school teammate threw a wicked knuckleball. It was nearly impossible to hit. He said it isn’t a pitch he could throw all the time because of the grip and amount of effort required to throw it correctly and accurately.