Adjective

/plān/,

plainer, comparative; plainest, superlative;

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obviously: unmistakably (`plain' is often used informally for `plainly'); "the answer is obviously wrong"; "she was in bed and evidently in great pain"; "he was manifestly too important to leave off the guest list"; "it is all patently nonsense"; "she has apparently been living here for some ...
apparent: clearly revealed to the mind or the senses or judgment; "the effects of the drought are apparent to anyone who sees the parched fields"; "evident hostility"; "manifest disapproval"; "patent advantages"; "made his meaning plain"; "it is plain that he is no reactionary"; "in plain view"
complain: express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about"
extensive tract of level open land; "they emerged from the woods onto a vast open plain"; "he longed for the fields of his youth"
knit: a basic knitting stitch
not elaborate or elaborated; simple; "plain food"; "stuck to the plain facts"; "a plain blue suit"; "a plain rectangular brick building"
In geography, a plain is land with relatively low relief, that is flat or gently rolling. Prairies and steppes are types of plains, and the archetype for a plain is often thought of as a grassland, but plains in their natural state may also be covered in shrublands, woodland and forest, or ...
The Plain (La Plaine) was the name given to the Girondists or Moderate party in the French National Convention, in contrast with The Mountain or Jacobin party.
The Plain were a rock band from Murfreesboro, Tennessee.
The Plain is the parade field at the United States Military Academy at West Point, NY. The flat terrain of the Plain is in contrast to the varied and hilly terrain of the remainder of the campus. ...
(Plains(album)) Plains is the eleventh album of pianist George Winston and eighth solo piano album, released in 1999. It was his first studio album consisting of original compositions since 1994's Forest. According to Winston, "this album is inspired by the plains and its people. ...
An expanse of land with relatively low relief; A plane; To lament, bewail; Flat, level. [from 14th c.]; Ordinary; lacking adornment or ornamentation; unembellished. [from 14th c.]; Evident to one's senses or reason; manifest, obvious, clear, unmistakable. [from 14th c. ...
(plaining) A lamentation
(plainly) In a plain manner; simply; basically; Obviously; clearly
(Plains) A region of flat land.
(Plains) Any fairly flat area that is not a desert, marsh, or forest.
(Plains) This is a piece of land that is generally flat and is mostly covered by grass.
(plains) Very flat, often grassy land.
(plains) extensive tracts of level or nearly level land. In North America, the plains extend from the southern Canadian prairie Provinces to Texas, and from the foothills of the Rocky Mountains in the west to the Mississippi River.
Deccan Plains; Ronny Heaslop says “‘I’m not one to keep a wife grilling in the Plains’” (49)
Guinness, as in  Flann O'Brien's "a pint of plain is your only man"
Region of uniform general slope, comparatively level, of considerable extent, and not broken by marked elevations and depressions (it may be an extensive valley floor or a plateau summit); an extent of level or nearly level land; a flat, gently sloping, or nearly level region of the sea floor.
An extensive lowland area that ranges from level to gently sloping or undulating.
The roundabout over Magdalen Bridge that is the meeting point of Cowley Road, St. Clement’s, Cowley Place is known locally as the Plain.
I don't like fancy atlases. Plain ones are the best.