plain - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “plain”

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plain

adjective [-er/-est only]  us   /pleɪn/

plain adjective [-er/-est only] (WITH NOTHING ADDED)

not decorated in any way; with nothing added: The catalog was sent in a plain brown envelope. The food is pretty plain (= prepared simply and without strong flavors), but there’s lots of it.

plain adjective [-er/-est only] (CLEAR)

obvious, or clear and easy to see or understand; not complicated: A group of wild horses was in plain view (= We could see them clearly). Why can’t they write these instructions in plain English?

plain adjective [-er/-est only] (NOT ATTRACTIVE)

(esp. of a woman or girl) not attractive: She always thought of herself as plain.
plain
adverb [not gradable]  us   /pleɪn/
infml It was just plain stupid to give him your telephone number.

plain

noun [C usually pl]  us   /pleɪn/

plain noun [C usually pl] (LAND)

earth science a large area of flat land at low elevation (= height above the surface of the earth): A number of paintings by Western artists show Indian settlements in the plains.
(Definition of plain from the Cambridge Academic Content Dictionary © Cambridge University Press)
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