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English definition of “plain”

plain

adjective [before noun] (COMPLETE)    /pleɪn/
(used for emphasis) complete: It was plain stupidity on Richard's part.Very and extremeComplete and wholeIntensifying expressions plainness     /-nəs/ noun [U] Not attractive to look atSerious and unpleasantPlain and ordinaryTedious and uninspiring
(Definition of plain adjective (COMPLETE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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