First-class and Unsustaining

Opposite meaning words

First-class adjective - Of the very best kind.

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Unsustaining is an antonym for first-class.

Definitions of First-class not found.

First-class is an antonym for unsustaining in weak topic.

Cite this Source

Unsustaining and First-class. (2016). Retrieved 2026, August 12, from https://thesaurus.plus/related/first-class/unsustaining

First-class & Unsustaining. N.p., 2016. Web. 12 Aug. 2026. <https://thesaurus.plus/related/first-class/unsustaining>.

Unsustaining or First-class. 2016. Accessed August 12, 2026. https://thesaurus.plus/related/first-class/unsustaining.