Formation of Comparative and Superlative:
Adjectives of more than two syllables form the Comparative and Superlative by putting more and most before the Positive.
Two-syllable adjectives ending infill (e.g. useful), less (e.g. hope less), ing (e.g. boring)and ed (e.g. surprised) and many others (e.g. modern, recent, foolish, famous, certain) take more and most.