Insubstantial and Substantial

Opposite meaning words

Insubstantial adjective - Being of a material lacking in sturdiness or substance.

Usage example: an insubstantial carton that could not possibly stand up during long-distance shipping

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Substantial is an antonym for insubstantial in topics: flimsy, weak.

Substantial adjective - Relating to or composed of matter.

Usage example: the Land of Oz turned out to be a world of dreams, even less substantial than a rainbow

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Insubstantial is an antonym for substantial in insignificant topic.

Cite this Source

Substantial and Insubstantial. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/insubstantial/substantial

Insubstantial & Substantial. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/insubstantial/substantial>.

Substantial or Insubstantial. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/insubstantial/substantial.

Google Ngram Viewer shows how "insubstantial" and "substantial" have occurred on timeline