Irregular
Irregular adjective - Departing from some accepted standard of what is normal.
Usage example: it was a bank customer's slightly irregular behavior that made people suspicious
Odd is a synonym for irregular in inappropriate topic. In some cases you can use "Odd" instead the word "Irregular" as an adjective or a noun, when it comes to topics like abnormal, casual, unusual, haphazard.
Nearby Words: irregularity, irregularly
Odd
Odd adjective - Noticeably different from what is generally found or experienced.
Usage example: the odd occurrences in the area attracted the attention of people interested in psychic phenomena
Irregular is a synonym for odd in occasional topic. You can use "Irregular" instead the word "Odd" as an adjective or a noun, if it concerns topics such as single, casual, unusual, haphazard.
Mutual synonyms
Both words in one sentence
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In the pitch darkness, the girl only hears an odd sound and then an irregular tapping against the top of the car.
Source: Nothing Is Scarier
Cite this Source
Odd and Irregular. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/irregular/odd
Irregular & Odd. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/irregular/odd>.
Odd or Irregular. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/irregular/odd.
Google Ngram Viewer shows how "irregular" and "odd" have occurred on timeline