Improper and Sinister

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Improper adjective - Not appropriate for a particular occasion or situation.

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Sinister and improper are semantically related. In some cases you can use "Sinister" instead an adjective "Improper".

Nearby Word: improperly

Sinister adjective - Being or showing a sign of evil or calamity to come.

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Improper and sinister are semantically related. Sometimes you can use "Improper" instead an adjective "Sinister".

Cite this Source

Sinister and Improper. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/improper/sinister

Improper & Sinister. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/improper/sinister>.

Sinister or Improper. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/improper/sinister.

Google Ngram Viewer shows how "improper" and "sinister" have occurred on timeline