- plain
- 1
/pleIn/ adjective
1 CLEAR very clear, and easy to understand or recognize; obvious (1): He spoke in Russian, but his message was plain enough. | it is plain (that): It was plain that management policies would have to change. | as plain as day/as plain as the nose on your face (=very clear): Phil loves her - that's as plain as day.2 SIMPLE without anything added or without decoration; simple: a plain white blouse | It's just a plain wooden table but it looks just right in this room. | plain food | a plain gold wedding ring3 HONEST showing clearly and honestly what you think about something, without trying to hide anything; frank 1 (1): Let's have some plain, truthful answers.4 make sth plain/make yourself plain to state something very clearly, in a way that cannot be misunderstood: They made their position plain from the start. | Let me make myself plain - we are not prepared to accept the deal as it stands.—see also: plainly5 the plain truth/fact is especially spoken used to say what you think is the simple and honest truth about a situation: The plain truth is he's just not good enough.6 plain stupidity/greed etc stupidity etc, and nothing else: His motive was plain greed.7 NOT BEAUTIFUL a word meaning ugly or unattractive, often used because you want to avoid saying this directly: Mrs Cookson was a rather plain woman.8 PAPER plain paper does not have lines on it9 (just) plain Mr/Mrs etc used to say that someone does not have a title, rank, or special name: No, it's not Doctor, just plain Mister.10 in plain English simply or clearly expressed, especially without using technical language: The computer system is explained in plain English.11 in plain clothes police officers in plain clothes are not wearing uniform12 be plain sailing to be very easy to do or achieve— plainness noun (U) 2 noun1 also plains (C) a large area of flat dry land: The grassy plain gave way to an extensive swamp. | the vast plains of central China2 (U) the ordinary stitch in knitting; knit (2)3 adverb plain stupid/wrong/rude etc informal simply or completely stupid etc: It's just plain crazy to spend all your pay as soon as you get it.
Longman dictionary of contemporary English. 2004.