To inflect according to the degrees of comparison; to
   state positive, comparative, and superlative forms of; as, most
   adjectives of one syllable are compared by affixing "- er" and "-est"
   to the positive form; as, black, blacker, blackest; those of more than
   one syllable are usually compared by prefixing "more" and "most", or
   "less" and "least", to the positive; as, beautiful, more beautiful,
   most beautiful.