Groundless and Rational
Opposite meaning words
Groundless
Groundless adjective - Having no basis in reason or fact.
Usage example: fears of a strike proved groundless
Rational is an antonym for groundless.
Nearby Words: ground, groundlessness
Rational
Rational adjective - Having the ability to reason.
Usage example: human beings are rational creatures
Groundless is an antonym for rational.
Cite this Source
Rational and Groundless. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/groundless/rational
Groundless & Rational. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/groundless/rational>.
Rational or Groundless. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/groundless/rational.
Google Ngram Viewer shows how "groundless" and "rational" have occurred on timeline