Function: adjective suffix or adverb suffix
Etymology: Middle English, from Old English -st, -est, -ost; akin to Old High German -isto (adj. superlative suffix), Greek -istos
― used to form the superlative degree of adjectives and adverbs of one syllable <fatt est > <latitude est >, of some adjectives and adverbs of two syllables <lucki est > <often est >, and less often of longer ones <beggarli est >