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English definition of “plain”

plain

adjective (WITH NOTHING ADDED)    /pleɪn/
B1 not decorated in any way; with nothing added: She wore a plain black dress. We've chosen a plain carpet (= one without a pattern) and patterned curtains. He prefers plain food - nothing too fancy. We're having plain blue walls in the dining room. a catalogue sent in a plain brown envelope a plain style of architecture plain yogurt (= with no added fruit or sugar)Plain and ordinaryTedious and uninspiring plain paper paper that has no lines on it: a letter written on plain paperPaper plainness     /-nəs/ noun [U] Not attractive to look atSerious and unpleasantPlain and ordinaryTedious and uninspiring
(Definition of plain adjective (WITH NOTHING ADDED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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