Meaning of -EST in English

-EST

transcription, транскрипция: [ -ɪst ]

You add -est 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 Advanced Learner's English Dictionary.      Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне.