What is the effect of using forms of the word "stupid" in the passage below?
At the beginning [the pigs] met with much stupidity and apathy. Some of the animals talked of the duty of loyalty to Mr. Jones, whom they referred to as 'Master,' or made elementary remarks such as 'Mr. Jones feeds us. If he were gone, we should starve to death.'...and the pigs had great difficulty in making them see that this was contrary to the spirit of Animalism. The stupidiest questions of all were asked by Mollie, the white mare.