First class and Insufficient

Opposite meaning terms

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

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Insufficient is an antonym for first class in profuse topic.

Insufficient adjective - Not coming up to an expected measure or meeting a particular need.

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First class is an antonym for insufficient.

Cite this Source

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

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

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

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