Synonyms of plain in English:

plain


See US English definition of plain

See UK English definition of plain

See Spanish definition of sencillo

adjective

1‘it was plain that something was very wrong’

SYNONYMS
obvious, clear, crystal clear, as clear as crystal, evident, apparent, manifest, patent, visible, discernible, perceptible, perceivable, noticeable, detectable, recognizable, observable, unmistakable, transparent, palpable, distinct, pronounced, marked, striking, conspicuous, overt, self-evident, indisputable
as plain as a pikestaff, staring someone in the face, writ large, written all over someone, as plain as day, plain to see, beyond doubt, beyond a doubt, beyond question
informal as plain as the nose on one's face, standing out like a sore thumb, sticking out like a sore thumb, standing out a mile, sticking out a mile

2‘put it in plain English’

SYNONYMS
intelligible, comprehensible, understandable, coherent, accessible, uncomplicated, lucid, perspicuous, unambiguous, clear, simple, straightforward, clearly expressed, clear-cut, direct, digestible, user-friendly
ANTONYMS

unclear, obscure

3‘there were indrawn breaths at such plain speaking’

SYNONYMS
candid, frank, outspoken, forthright, plain-spoken, direct, honest, truthful, blunt, downright, unvarnished, bald, straight from the shoulder, explicit, unequivocal
informal upfront
archaic round, free-spoken

4‘her plain black dress’

SYNONYMS
simple, ordinary, unadorned, undecorated, unembellished, unornamented, unpretentious, unostentatious, unfussy, homely, homespun, basic, modest, unsophisticated, penny plain, without frills
stark, severe, spartan, austere, chaste, bare, uncluttered, restrained, muted, unpatterned, patternless, everyday, workaday
ANTONYMS

fancy, elaborate

5‘a rather plain girl’

SYNONYMS
unattractive, unprepossessing, as plain as a pikestaff, ugly, ill-favoured, unlovely, ordinary-looking
North American homely
informal not much to look at, fugly
British informal no oil painting
New Zealand informal huckery
ANTONYMS

attractive, beautiful, good-looking

6‘a plain, honest man with no nonsense about him’

SYNONYMS
straightforward, unpretentious, simple, ordinary, average, unassuming, unaffected, honest-to-goodness, ingenuous, artless, guileless, sincere
North American cracker-barrel
ANTONYMS

pretentious, affected

7‘it was plain bad luck’

SYNONYMS
sheer, pure, downright, out-and-out, unmitigated, rank, nothing other than

adverb

1‘this is just plain stupid’

SYNONYMS
downright, utterly, absolutely, completely, totally, really, thoroughly, positively, profoundly, categorically, simply, incontrovertibly, unquestionably, undeniably
informal plumb

noun

1‘the vast treeless plains of North America’

SYNONYMS
grassland, flatland, lowland, pasture, meadowland, open country, prairie, savannah, steppe
tableland, tundra, pampas, campo, llano, vega
veld
pediplain
literary champaign

Phrases

    plain sailing

    ‘getting their products onto the market has not been plain sailing’


    SYNONYMS
    uncomplicated, straightforward, simple, easy, effortless, painless, undemanding, unexacting
    elementary, a five-finger exercise, child's play
    routine
    informal as easy as falling off a log, as easy as pie, as easy as ABC, a piece of cake, a cinch, a snip, easy-peasy, no sweat, a doddle, money for old rope, money for jam, kids' stuff, a breeze, a doss, a cakewalk
    North American informal duck soup, a snap
    Australian, New Zealand informal a bludge, a snack
    South African informal a piece of old tackle