First class and Flat

Opposite meaning terms

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

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Flat is an antonym for first class in stylish topic.

Flat adjective - Being neither more nor less than a certain amount, number, or extent.

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First class is an antonym for flat.

Nearby Words: flatter, flatly, flatness, flatlet, flatting

Cite this Source

Flat and First class. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/first_class/flat

First class & Flat. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/first_class/flat>.

Flat or First class. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/first_class/flat.

Google Ngram Viewer shows how "first class" and "flat" have occurred on timeline