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Definition of plain adverb from the Oxford Advanced Learner's Dictionary

plain

adverb
 
/pleɪn/
 
/pleɪn/
(informal)
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  1. used to emphasize how bad, stupid, etc. something is
    • plain stupid/wrong
    Homophones plain | planeplain   plane
     
    /pleɪn/
     
    /pleɪn/
    • plain adjective
      • She likes plain food, without sauces or cheese.
    • plain noun
      • Wheat is still grown on the Lombardy plain.
    • plain adverb (informal)
      • That's just plain silly!
    • plane noun
      • They recently flew into London on a private plane.
    • plane verb
      • You may need to plane the surface for a smoother fit.
    Word OriginMiddle English: from Old French plain, from Latin planus, from a base meaning ‘flat’.
See plain in the Oxford Advanced American Dictionary
indeed
adverb
 
 
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