Indeed, who Is stupid now? I think I know...

Postillion doesn't perhaps grasp the near universality of the -er, -est suffixes. Professor Marvel understands them to be a way to superlative-ize any adjective, unless there is an exception as with good/better/best, bad/worse/worst. Granted, in some cases, adding -er/-est just sounds sort of stupid. And in that case, we just use more or most in front of the adjective. It's just not that mysterious.