Stupider and stupidest are real words in good standing. While there are many (often contradictory) rules on comparative and superlative adjectives, there is no rule against stupider and stupidest, and the words have a long history of usage.

Stupider is the comparative form of the adjective stupid. Because stupid is a two-syllable word, its comparative form can be created either by adding the suffix “-er” or by using more. The same goes for the superlative form of stupid. It can be either the stupidest or the most stupid.

It turns out stupider is an actual word. The word stupid is an adjective that refers to someone or something that’s foolish or senseless. This adjective, however, only gets you so far. When you want to compare two nouns, you’ll need what’s called a comparative adjective.

As surprising as it might be to some, stupider is actually a proper word. Many people will claim it’s incorrect and prefer the term more stupid, but either is valid. To understand why this is, there are a couple of things to know.

Yes, stupider is a word. It is the comparative form of the adjective “stupid.” Is stupidest a word? Yes, stupidest is a word. It is the superlative form of the adjective “stupid.” Are stupider and stupidest grammatically correct?