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English definition of “plain”

plain

adjective (NOT BEAUTIFUL)    /pleɪn/
C2 (especially of a woman or girl) not beautiful: She had been a very plain child.Not attractive to look atSerious and unpleasant a plain Jane a woman or girl who is not attractive: If she'd been a plain Jane, she wouldn't have had all the attention.Not attractive to look atSerious and unpleasant plainness     /-nəs/ noun [U] Not attractive to look atSerious and unpleasantPlain and ordinaryTedious and uninspiring
(Definition of plain adjective (NOT BEAUTIFUL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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