No problem
Plain and no problem are semantically related. in clear topic. In some cases you can use "Plain" instead an adjective phrase "No problem", when it comes to topics like not difficult.
Plain
Plain adjective - Free from all additions or embellishment.
No problem and plain are semantically related. Sometimes you can use "No problem" instead an adjective "Plain".
Mutual synonyms
Both terms in one sentence
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Profit fully admits that he's a manipulative sociopath himself who has no problem with destroying people's lives to get ahead or even flat-out murder, but he considers MacClane plain Evil and gives Nora the opportunity to get some well-deserved revenge on the bastard.
Source: Series / Profit -
After an engine makes three mistakes in their given job due to their Fatal Flaw or is just being plain incompetent, and after The Fat Controller calls them out for causing "confusion and delay", the engine will begin making things right with absolutely no problem at all.
Cite this Source
Plain and No problem. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/no_problem/plain
No problem & Plain. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/no_problem/plain>.
Plain or No problem. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/no_problem/plain.
Google Ngram Viewer shows how "no problem" and "plain" have occurred on timeline