Plain
Plain adjective - Free from all additions or embellishment.
Unclassifiable and plain are semantically related. In some cases you can use "Unclassifiable" instead an adjective "Plain".
Unclassifiable
Unclassifiable adjective - Not possible to classify.
Plain and unclassifiable are semantically related. Sometimes you can use "Plain" instead an adjective "Unclassifiable".
Both words in one sentence
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Cynicism: Broad parts of his work are plain unclassifiable on this scale, but usually idealistic in tone yet with cynical undertones.
Source: Creator / Masaaki Yuasa
Cite this Source
Unclassifiable and Plain. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/plain/unclassifiable
Plain & Unclassifiable. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/plain/unclassifiable>.
Unclassifiable or Plain. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/plain/unclassifiable.
Google Ngram Viewer shows how "plain" and "unclassifiable" have occurred on timeline