First class and Unable

Opposite meaning terms

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

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Unable is an antonym for first class in superior topic.

Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.

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First class is an antonym for unable.

Cite this Source

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

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

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

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