-EST

I. adjective suffix or adverb suffix Etymology: Middle English, from Old English -st, ~, -ost; akin to Old High German -isto (adjective superlative suffix), Greek -istos — used to form the superlative degree of adjectives and adverbs of one syllable , of some adjectives and adverbs of two syllables , and less often of longer ones II. verb suffix or -st Etymology: Middle English, from Old English ~, -ast, -st; akin to Old High German -ist, -ōst, -ēst, 2d singular ending — used to form the archaic second person singular of English verbs (with thou)