plain
High-frequency (A2)Neutral - used across all registers from informal to formal.
Definition
Meaning
Simple, without anything added or without decoration; not complicated; easy to see or understand.
Can refer to a large, flat area of land; also used to emphasize something (e.g., 'plain stupid'), or to describe something clear and unambiguous.
Linguistics
Semantic Notes
The primary sense is 'not fancy or decorated.' The adjective is strongly polysemous, covering appearance (plain dress), geography (the plains), clarity (plain instructions), and emphasis (plain nonsense).
Dialectal Variation
British vs American Usage
Differences
Minimal. Spelling of 'plain clothes' (police) is identical. Geographical term 'plain' is used identically.
Connotations
Similar. 'Plain' describing appearance can be equally direct/blunt in both varieties.
Frequency
Equally common and used in identical constructions.
Vocabulary
Collocations
Grammar
Valency Patterns
It is plain that + clauseto make it plain (that)plain to see/understandadjective + and + plain (e.g., simple and plain)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “(as) plain as day”
- “plain sailing”
- “in plain English”
- “a plain Jane”
Usage
Context Usage
Business
'We need the report in plain English for all stakeholders.' (Clarity)
Academic
'The data present a plain contradiction to the earlier hypothesis.' (Clear, unambiguous)
Everyday
'I'll have a plain cheese pizza, please.' or 'The instructions were plain enough.'
Technical
(Cartography) 'The river flows across the coastal plain.'
Examples
By Part of Speech
verb
British English
- [Archaic/rare in modern use, found in older texts as 'to complain' or 'to lament']
American English
- [Archaic/rare in modern use]
adverb
British English
- That's just plain wrong.
- He's plain annoying.
American English
- She was plain tired after the long trip.
- That idea is plain stupid.
adjective
British English
- She wore a plain black dress to the meeting.
- The answer is perfectly plain.
American English
- He ordered a plain bagel with his coffee.
- It's plain to everyone that the system is broken.
Examples
By CEFR Level
- I like plain chocolate.
- The dress was very plain.
- The map shows mountains and a large plain.
- He explained it in plain language.
- The detective was working in plain clothes.
- It became plain that they had misunderstood the contract.
- Her plain speaking, while refreshing, sometimes caused offence.
- The architectural style was deliberately plain and austere.
Learning
Memory Aids
Mnemonic
Think of a PLAIN piece of paper – it's flat, simple, and has nothing on it.
Conceptual Metaphor
UNDERSTANDING IS SEEING ('Her meaning was plain.'), SIMPLICITY IS PURITY ('plain water').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'plane' (самолет) which is a homophone. 'Plain' as a noun is 'равнина', not 'простой'.
Common Mistakes
- Confusing spelling with 'plane' (the aircraft). Incorrect: 'It was plane to see.' Correct: 'It was plain to see.'
Practice
Quiz
In which sentence is 'plain' used as an adverb?
FAQ
Frequently Asked Questions
Not inherently. It is neutral, meaning 'simple' or 'clear.' However, when describing a person's appearance ('plain Jane'), it can be perceived as negative or blunt.
They are often synonyms. 'Plain' often stresses the absence of decoration or embellishment ('plain walls'), while 'simple' can stress ease of understanding or absence of complexity ('a simple solution').
In modern English, almost never. The archaic verb 'plain' (to complain) is obsolete. The modern verb is 'complain.'
It's an idiom meaning a period of easy, unobstructed progress. 'Once we get the permissions, it should be plain sailing.'