The grammatical rule for this issue says that single syllable words (like sad) form their comparative sadder) and superlative (saddest) degree by adding a syllable rather than using more or most in front of them. For words of three or more syllables (like beautiful) you must use "more" or "most" rather then adding a syllable at the end. It's only two syllable words where you actually have a choice; you add the "er" or "est" ending unless it makes the word awkward to say . ( For example, you'd say "ugly, uglier, ugliest" but would say "gracious, more gracious, most gracious" since saying "graciousest" is sort of a tongue twister.)
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