What is the meaning of plain?

noun

• Extensive tract of level open land.
  • usage: "they emerged from the woods onto a vast open plain"; "he longed for the fields of his youth"
  • synonyms: field, champaign
• A basic knitting stitch.
  • synonyms: knit, knit stitch, plain stitch

verb

• Express complaints, discontent, displeasure, or unhappiness.
  • usage: "My mother complains all day"; "She has a lot to kick about"
  • synonyms: complain, kick, sound off, quetch, kvetch

adjective

• Clearly revealed to the mind or the senses or judgment.
  • usage: "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"
  • synonyms: apparent, evident, manifest, patent, unmistakable
• Not elaborate or elaborated; simple.
  • usage: "plain food"; "stuck to the plain facts"; "a plain blue suit"; "a plain rectangular brick building"
• Lacking patterns especially in color.
  • synonyms: unpatterned
• Not mixed with extraneous elements.
  • usage: "plain water"; "sheer wine"; "not an unmixed blessing"
  • synonyms: sheer, unmingled, unmixed
• Free from any effort to soften to disguise.
  • usage: "the plain and unvarnished truth"; "the unvarnished candor of old people and children"
  • synonyms: unvarnished
• Lacking embellishment or ornamentation.
  • usage: "a plain hair style"; "unembellished white walls"; "functional architecture featuring stark unornamented concrete"
  • synonyms: bare, spare, unembellished, unornamented
• Lacking in physical beauty or proportion.
  • usage: "a homely child"; "several of the buildings were downright homely"; "a plain girl with a freckled face"
  • synonyms: homely

adverb

• Unmistakably (`plain' is often used informally for `plainly'. )
  • usage: "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 time"; "I thought he owned the property, but apparently not"; "You are plainly wrong"; "he is plain stubborn"
  • synonyms: obviously, evidently, manifestly, patently, apparently, plainly