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Usually, superlative adjectives with one or two syllables end with -est; for example, "That's the easiest English exam I have ever sat!" "Today was the hottest day of the month."
Of course, as always in English, you'll find there are some exceptions to this rule: He is the most nervous man in the room is grammatically wrong, but to use the correct grammar 'nervousest' is too much of a mouthful, so we don't (use it).
'Stupid' is an adjective that we use with both 'most' and '-est', and 'simple' is another.
Superlative adjectives with three or more syllables are preceded by 'most'; for example, "That's the most expensive pair of shoes I have ever bought!"
We don't use superlatives with verbs - 'simple' is an adjective.