Reasonable and Unauthorised

Opposite meaning words

Reasonable adjective - According to the rules of logic.

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Unauthorised is an antonym for reasonable.

Unauthorised adjective - Not endowed with authority.

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Reasonable is an antonym for unauthorised.

Nearby Word: unauthorized

Cite this Source

Unauthorised and Reasonable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/reasonable/unauthorised

Reasonable & Unauthorised. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/reasonable/unauthorised>.

Unauthorised or Reasonable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/reasonable/unauthorised.

Google Ngram Viewer shows how "reasonable" and "unauthorised" have occurred on timeline