Groundless and Rational

Opposite meaning words

Groundless adjective - Having no basis in reason or fact.

Usage example: fears of a strike proved groundless

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Rational is an antonym for groundless.

Nearby Words: ground, groundlessness

Rational adjective - Having the ability to reason.

Usage example: human beings are rational creatures

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Groundless is an antonym for rational.

Cite this Source

Rational and Groundless. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/groundless/rational

Groundless & Rational. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/groundless/rational>.

Rational or Groundless. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/groundless/rational.

Google Ngram Viewer shows how "groundless" and "rational" have occurred on timeline