Definition of Plain

Adjective: plain (plainer,plainest) pleyn

Clearly revealed to the mind or the senses or judgment
"made his meaning plain"; "it is plain that he is no reactionary"; "in plain view";
- apparent, evident, manifest, patent, unmistakable, unmistakeable
Not elaborate or elaborated; simple
"plain food"; "stuck to the plain facts"; "a plain blue suit"; "a plain rectangular brick building"
Lacking patterns especially in colour
- unpatterned
Not mixed with extraneous elements
"plain water";
- sheer, unmingled, unmixed
Without modification, esp. without any attempt to soften or disguise
"the plain and unvarnished truth";
- unvarnished
Lacking embellishment or ornamentation
"a plain hair style";
- bare, spare, unembellished, unornamented
Lacking in physical beauty or proportion
"a plain girl with a freckled face";
- homely [N. Amer], unhandsome

Noun: plain pleyn

Extensive tract of level open land
"they emerged from the woods onto a vast open plain";
- field, champaign, flatland
A basic knitting stitch
- knit, knit stitch, plain stitch

Adverb: plain pleyn

Unmistakably; visibly clear; in an evident manner
"he is plain stubborn";
- obviously, evidently, manifestly, patently, apparently, plainly, clearly

Verb: plain pleyn
Usage: archaic

Express complaints, discontent, displeasure, or unhappiness
- complain, kick, sound off, quetch, kvetch [N. Amer], moan