First class and Indefinite

Opposite meaning terms

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

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Indefinite is an antonym for first class in stylish topic.

Indefinite adjective - Being or seeming to be without limits.

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First class is an antonym for indefinite.

Nearby Words: indefinable, indefinitely

Cite this Source

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

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

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

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