Substantial and Unimportant

Opposite meaning words

Substantial adjective - Having great meaning or lasting effect.

Usage example: substantial changes to the school dress code that made a lot of people unhappy

Show all Definitions

Unimportant adjective - Lacking importance.

Usage example: we figured that the details were unimportant as long as we got the basic design correct

Show all Definitions

Substantial is an antonym for unimportant in topics: value, important.

Cite this Source

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

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

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

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