plain

1 of 5

adjective

ˈplān 

1

: lacking ornament : undecorated

2

: free of extraneous matter : pure

3

: free of impediments to view : unobstructed

4

a(1)

: evident to the mind or senses : obvious

it's perfectly plain that they will resist

(2)

: clear

let me make my meaning plain

b

: marked by outspoken candor : free from duplicity or subtlety : blunt

plain talk

5

a

: belonging to the masses : common

b

: lacking special distinction or affectation : ordinary

6

: characterized by simplicity : not complicated

plain home-cooked meals

7

: lacking beauty or ugliness

8

archaic : even, level

plainly adverb

plainness

ˈplān-nəs 

noun

plain

2 of 5

noun

1

a

: an extensive area of level or rolling treeless country

b

: a broad unbroken expanse

2

: something free from artifice, ornament, or extraneous matter

plain

3 of 5

adverb (1)

: in a plain manner : without obscurity or ambiguity

saw them clearly and told you plain

—Amer. Documentation

plain

4 of 5

adverb (2)

: absolutely sense 1a

plain wrong

plain

5 of 5

verb

plained; plaining; plains

intransitive verb

archaic

: complain

Synonyms

Adjective

• simple

Noun

• prairie
• steppe
• grassland
• pampa

Adverb (1)

• straightforward
• openly
• plainly
• straight
• sincerely
• simply
• straightforwards
• honestly
• straightforwardly
• abruptly

Choose the Right Synonym for plain

common, ordinary, plain, familiar, popular, vulgar mean generally met with and not in any way special, strange, or unusual.

common implies usual everyday quality or frequency of occurrence

a common error

lacked common honesty

and may additionally suggest inferiority or coarseness.

common manners

ordinary stresses conformance in quality or kind with the regular order of things.

an ordinary pleasant summer day

a very ordinary sort of man

plain is likely to suggest homely simplicity.

plain hard-working people

familiar stresses the fact of being generally known and easily recognized.

a familiar melody

popular applies to what is accepted by or prevalent among people in general sometimes in contrast to upper classes or special groups.

a writer of popular romances

vulgar, otherwise similar to popular, is likely to carry derogatory connotations (as of inferiority or coarseness).

souvenirs designed to appeal to the vulgar taste

evident, manifest, patent, distinct, obvious, apparent, plain, clear mean readily perceived or apprehended.

evident implies presence of visible signs that lead one to a definite conclusion.

an evident fondness for sweets

manifest implies an external display so evident that little or no inference is required.

manifest hostility

patent applies to a cause, effect, or significant feature that is clear and unmistakable once attention has been directed to it.

patent defects

distinct implies such sharpness of outline or definition that no unusual effort to see or hear or comprehend is required.

a distinct refusal

obvious implies such ease in discovering that it often suggests conspicuousness or little need for perspicacity in the observer.

the obvious solution

apparent is very close to evident except that it may imply more conscious exercise of inference.

for no apparent reason

plain suggests lack of intricacy, complexity, or elaboration.

her feelings about him are plain

clear implies an absence of anything that confuses the mind or obscures the pattern.

a clear explanation

frank, candid, open, plain mean showing willingness to tell what one feels or thinks.

frank stresses lack of shyness or secretiveness or of evasiveness from considerations of tact or expedience.

frank discussions

candid suggests expression marked by sincerity and honesty especially in offering unwelcome criticism or opinion.

a candid appraisal

open implies frankness but suggests more indiscretion than frank and less earnestness than candid.

open in saying what they think

plain suggests outspokenness and freedom from affectation or subtlety in expression.

plain talk

Examples of plain in a Sentence

Adjective

It was a plain room with no curtains.

She was wearing plain black shoes.

He printed the picture on plain paper.

a piece of plain chicken

You don't have to call me Mr. Johnson—just plain Fred will be fine.

What he said is a lie, plain and simple.

Noun

the Great Plains of the United States

the first settlers in that area lived on the vast plains in lonely log cabins

Adverb (1)

told her plain that he loved her

Recent Examples on the Web

Adjective

There are over 20 flavors (watermelon’s a winner) to beat plain water for energy. —Parker Hall, Wired News, 11 July 2025

Avocado and Lime For a creamier dressing, an avocado-lime blend can turn a plain salad into a savory and filling meal. —Cristina Mutchler, Verywell Health, 10 July 2025

Noun

The line is rooted in outerwear, which includes wrap coats in twin layers of double-faced wool; reversible jackets with one side plain, the other patterned; and crinkled unisex trenchcoats that pack up neatly into a travel pouch, printed with a bicycle pattern drawn from Veldkamp’s art. —Joelle Diderich, Footwear News, 10 July 2025

While the dire wolves were promoted by investor George R.R. Martin, this latest project started with a pitch from Lord of Rings director and unofficial New Zealand tourism czar Peter Jackson, whose films introduced the world to the stunning mountain ranges and grassy plains of his homeland. —Andrea Marks, Rolling Stone, 8 July 2025

Adverb

To put it plain, Dynasty Mode is mostly fantastic as EA even expanded the already strong Team Builder feature to improve team creation. —Brian Mazique, Forbes.com, 14 July 2025

Amazon Basics Hydrocortisone Cream Bug bites, rashes, and skin reactions are the kinds of discomforts that can turn an otherwise great day just plain unpleasant. —Alesandra Dubin, Travel + Leisure, 11 July 2025

Verb

However, studies comparing coconut water to plain water or sports drinks for hydration are limited.16 Electrolyte powders: Electrolyte powders often contain more sodium and potassium but less sugar than sports drinks. —Lindsey Desoto, Health, 1 July 2025

Stick to plain, black-and-white paper, which uses soy- or water-based ink, a much safer choice. —Lauren Landers, Better Homes & Gardens, 29 June 2025

Word History

Etymology

Noun

Middle English, from Anglo-French, from Latin planum, from neuter of planus flat, plain — more at floor

Adverb (2)

partly from Middle English plein entire, complete, from Anglo-French, full, from Latin plenus; partly from plain entry 3 — more at full

Verb

Middle English, from Anglo-French pleindre, plaindre, from Latin plangere to lament — more at plaint

First Known Use

Adjective

14th century, in the meaning defined at sense 8

Noun

14th century, in the meaning defined at sense 1a

Adverb (1)

14th century, in the meaning defined above

Adverb (2)

14th century, in the meaning defined above

Verb

14th century, in the meaning defined above

Phrases Containing plain

• abyssal plain
• (as) plain as day
• (as) plain as the nose on your face
• in plain sight
• in plain view
• just plain folks
• make it plain
• plain chocolate
• plain clothes
• plain flour
• plain Jane
• plain-laid
• plain sailing
• plain-vanilla
• plain weave
• plain-woven

Rhymes for plain

• ane
• bane
• blain
• brain
• cane
• chaine
• cheyne
• deign
• drain
• fain
• fane
• feign

Kids Definition

plain

1 of 4 noun

ˈplān 

: a broad area of level or rolling treeless country

plain

2 of 4 adjective

1

: having no pattern or decoration

her dress was plain

2

: free of added or extra matter : pure

a glass of plain water

3

: open and clear to the sight

in plain view

4

a

: clear to the mind

your meaning was plain

b

: frank, blunt

plain speaking

5

a

: of common or average accomplishments or position : ordinary

plain people

b

: not complicated or hard to do

plain sewing

6

: neither ugly nor beautiful

plainly adverb

plainness

ˈplān-nəs

noun

plain

3 of 4 adverb

: in a plain or simple manner

plain

4 of 4 adverb

: to a complete degree : totally

were plain overcome by all the problems

Etymology

Noun

Middle English plain "a stretch of nearly level treeless country," from early French plain (same meaning), derived from Latin planus "flat" — related to plane entry 1

Adverb

partly from Middle English plein (adjective) "entire, complete" (derived from Latin plenus "full") and partly from plain (adverb) "in a plain manner" (derived from Latin planus "flat, level")