Which is correct - "most quiet" or "quietest"? [duplicate]
Solution 1:
Short Answer: "quietest" sounds better to me, but both are grammatically correct
Long Answer: For comparatives and superlative(-er and -est, respectively) forms of words, alwaysuse "most" for words with words for three or more syllables. For words with one syllable, always use "-est." Two syllable words can vary, some with only one correct comparative/superlative and some where both are acceptable. Quiet is a word where both forms are acceptable.
Source: http://www.oxforddictionaries.com/us/words/forming-comparative-and-superlative-adjectives-american