Plain
Plain adjective - Free from added matter.
Usage example: I'd prefer my pasta plain, not flavored with tomato or spinach or anything else
Straight is a synonym for plain in clean topic. In some cases you can use "Straight" instead the word "Plain" as an adjective or an adverb or a noun, when it comes to topics like unmixed.
Straight
Straight adverb - In an honest and direct manner.
Usage example: we gave it to him straight: his performance would have to improve—or he was out
Plain is a synonym for straight in honest topic. You can use "Plain" instead the word "Straight" as an adjective or an adverb or a noun, if it concerns topics such as unmixed, pure, clean, frank.
Mutual synonyms
Both words in one sentence
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Berserk Button: Rainbow gets hers pushed when asked plain and straight if she actually killed Ace Swift.Rainbow: I told you, I DIDN'T KILL ANYPONY!!
Source: Web Animation / Turnabout Storm -
Well, I tell you plain and straight right now, its nothing of the kind.
Source: Film / Downstairs - Alien Invasion: Played straight, subverted, and plain played with with the Sakrohm.
Source: Video Game / Urban Rivals
Cite this Source
Straight and Plain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/plain/straight
Plain & Straight. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/plain/straight>.
Straight or Plain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/plain/straight.
Google Ngram Viewer shows how "plain" and "straight" have occurred on timeline