Irregular
Irregular adjective - Contrary to rule or accepted order or general practice.
Usage example: irregular hiring practices
Improper is a synonym for irregular in inappropriate topic. In some cases you can use "Improper" instead an adjective "Irregular", when it comes to topics like abnormal, against the rules.
Nearby Words: irregularity, irregularly
Improper
Improper adjective - Not conforming to legality, moral law, or social convention.
Usage example: improper banking practices
Irregular is a synonym for improper in inappropriate topic. You can use "Irregular" instead an adjective "Improper", if it concerns topics such as incorrect, not suitable.
Nearby Word: improperly
Mutual synonyms
Cite this Source
Improper and Irregular. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/irregular/improper
Irregular & Improper. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/irregular/improper>.
Improper or Irregular. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/irregular/improper.
Google Ngram Viewer shows how "irregular" and "improper" have occurred on timeline