Meaning of -EST in English

-EST

You add ~ to many short adjectives to form superlatives. For example, the superlative of ‘nice’ is ‘nicest’; the superlative of ‘happy’ is ‘happiest’. You also add it to some adverbs that do not end in -ly. For example, the superlative of ‘soon’ is ‘soonest’.

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Collins COBUILD.      Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) .