<em>The most worst</em> is an incorrect form of superlative of BAD, as <em>the worst</em> is already a superlative, or 3rd form of bad. Using <em>most </em>with <em>worst </em>is excessive and not necessary.<em> The most</em> form is usually used with the adjectives and adverbs, especially those of more than one syllable.
For example<em> the most beautiful, the most disturbing, the most relevant, the most unbelievable</em>, etc.
