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plain

adjectiveadverbnounverbnounverbadjectivecommon in dialogue

  • United States//pleɪn//
  • United States/[pl̥eɪn]/
  • Scotland//plen//
  • //plein//
  • //plen//

Simple, unaltered. Ordinary; lacking adornment or ornamentation; unembellished.

adjective

  1. 1

    archaicFlat, level.

    The crooked shall be made straight, and the rough places plain.

    The Vampyre Bat. Tailless bat with the nose plain, and the flying-membrane divided between the thighs.

  2. 2

    Simple, unaltered. Ordinary; lacking adornment or ornamentation; unembellished.

    He was dressed simply in plain black clothes.

    a plain tune

    The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.

  3. 3

    Simple, unaltered. Of just one colour; lacking a pattern.

    a plain pink polycotton skirt

  4. 4

    Simple, unaltered. Simple in habits or qualities; unsophisticated, not exceptional, ordinary.

    They're just plain people like you or me.

    plain yet pious Christians

    the plain people

  5. 5

    Simple, unaltered. Having only few ingredients, or no additional ingredients or seasonings; not elaborate, without toppings or extras.

    Would you like a poppy bagel or a plain bagel?

  6. 6

    Simple, unaltered. Containing no extended or nonprinting characters (especially in plain text).

  7. 7

    Obvious. Evident to one's senses or reason; manifest, clear, unmistakable.

    In fact, by excommunication or persuasion, by impetuosity of driving or adroitness in leading, this Abbot, it is now becoming plain everywhere, is a man that generally remains master at last.

  8. 8

    Obvious. Downright; total, unmistakable (as intensifier).

    His answer was just plain nonsense.

  9. 9

    Open. Honest and without deception; candid, open; blunt.

    Let me be plain with you: I don't like her.

    [VV]e are able with playne demonſtration to proue, and vvith reaſon to perſvvade that in tymes paſt our fayth vvas alike, that then vve preached thinges correſpondent vnto the forme of faith already published of vs, ſo that none in this behalfe can repyne or gaynesay vs.

    an honest mind, and plain, he must speak truth

    The Quaker was no sooner assured by this fellow of the birth and low fortune of Jones, than all compassion for him vanished; and the honest plain man went home fired with no less indignation than a duke would have felt at receiving an affront from such a person.

  10. 10

    Open. Clear; unencumbered; equal; fair.

    Our troops beat an army in plain fight.

  11. 11

    Not unusually beautiful; unattractive.

    Throughout high school she worried that she had a rather plain face.

    Up to that time the girl had never really done her hair, and she regarded boots merely as things to protect the feet. Suddenly it dawned on her that she was considered plain and that she diffused an atmosphere of intellectual frost.

  12. 12

    Not a trump.

Etymology

From Middle English pleyn, borrowed from Anglo-Norman pleyn, playn, Middle French plain, plein, and Old French plain, from Latin plānus (“flat, even, level, plain”). Doublet of llano, piano, plane, and plan.

adverb

  1. 1

    Simply.

    It was just plain stupid.

    I plain forgot.

    One trouble, he explained, is that dope pushers flock to neighborhoods where two gangs are at war, knowing they will find buyers among members of the gangs who are so keyed up that they welcome any kind of relaxation or who are just plain afraid.

  2. 2

    archaicPlainly; distinctly.

    Tell me plain: do you love me or no?

noun

  1. 1

    An expanse of land with relatively low relief and few trees, especially a grassy expanse.

    Him the Ammonite / Worshipped in Rabba and her watery plain.

    1961, J. A. Philip. Mimesis in the Sophistês of Plato. In: Proceedings and Transactions of the American Philological Association 92. p. 467. For Plato the life of the philosopher is a life of struggle towards the goal of knowledge, towards “searching the heavens and measuring the plains, in all places seeking the nature of everything as a whole”

  2. 2

    A broad, flat expanse in general, as of water.

    Fair ship, that from the Italian shore, ⁠Sailest the placid ocean-plains ⁠With my lost Arthur’s loved remains, Spread thy full wings, and waft him o’er.

  3. 3

    archaicSynonym of field in reference to a battlefield.

    You have stormed no town and found the money there ; neither did you find it in the plains of Plassey after the defeat of the Nawab

    Lead forth my soldiers to the plain.

  4. 4

    Variant of planeobsoleteAlternative spelling of plane: a flat geometric field.

Etymology

From Old French plain, from Latin plānum (“level ground, a plain”), neuter substantive from plānus (“level, even, flat”). Doublet of llano, piano, and plane.

verb

  1. 1

    obsoleteTo level; to raze; to make plain or even on the surface.

    Frownst thou thereat aspiring Lancaster, The sworde shall plane the furrowes of thy browes,

    We would rake Europe rather, plain the East;

  2. 2

    obsoleteTo make plain or manifest; to explain.

    What’s dumb in show, I’ll plain with speech.

noun

  1. 1

    rareA lamentation.

    The warrior-threat, the infant's plain, The mother's screams, were heard in vain;

Etymology

From Anglo-Norman plainer, pleiner, variant of Anglo-Norman and Old French pleindre, plaindre, from Latin plangere.

verb

  1. 1

    obsoleteTo complain.

    Persones and parisch prestes · pleyned hem to þe bischop / Þat here parisshes were pore · sith þe pestilence tyme […].

  2. 2

    archaicTo lament, bewail.

    to plain a loss

    Shepheards, that wont[…] Oft times to plaine your loves concealed smart

    Thy mother could thee for thy cradle set Her husband's rusty iron corselet; Whose jargling sound might rock her babe to rest, That never plain'd of his uneasy nest.

    Then, again, she almost thought that the soft and wailing wind which swept mournfully through the sepulchral boughs of the large old yews, had a voice not of this world—was it the inarticulate plaining of her brother's gentle spirit, debarred from intercourse, but still keeping over her the deep and eternal watch of love?

adjective

  1. 1

    obsoleteFull, complete in number or extent.

Etymology

From Middle English pleyn, borrowed from Old French plein, from Latin plēnus (“full, filled, complete”). Ultimately from Proto-Italic *plēnos, from Proto-Indo-European *pl̥h₁nós (“full”). Doublet of plene, plenary, and full.

Forms

plural
plains
comparative
plainer
superlative
plainest
past tense
plained
past participle
plained
present participle
plaining
third person singular
plains
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).