Doubtful and Regular

Opposite meaning words

Doubtful adjective - Not feeling sure about the truth, wisdom, or trustworthiness of someone or something.

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Regular is an antonym for doubtful.

Regular adjective - Having no exceptions or restrictions.

Usage example: your room is a regular sty, and you need to clean it before you can go to the movies

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Doubtful is an antonym for regular.

Cite this Source

Regular and Doubtful. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/doubtful/regular

Doubtful & Regular. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/doubtful/regular>.

Regular or Doubtful. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/doubtful/regular.

Google Ngram Viewer shows how "doubtful" and "regular" have occurred on timeline