Reasonable and Without foundation
Opposite meaning terms
Reasonable
Reasonable adjective - According to the rules of logic.
Without foundation is an antonym for reasonable.
Without foundation
Reasonable is an antonym for without foundation in topics: not making sense, not based on fact.
Cite this Source
Without foundation and Reasonable. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/reasonable/without_foundation
Reasonable & Without foundation. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/reasonable/without_foundation>.
Without foundation or Reasonable. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/reasonable/without_foundation.
Google Ngram Viewer shows how "reasonable" and "without foundation" have occurred on timeline