Erratic
Erratic adjective - Lacking in steadiness or regularity of occurrence.
Usage example: because of your erratic attendance at practice, you're in danger of being cut from the team
Sudden and erratic are semantically related. In some cases you can use "Sudden" instead an adjective "Erratic".
Nearby Word: errant
Sudden
Sudden adjective - Not expected.
Erratic and sudden are semantically related. Sometimes you can use "Erratic" instead an adjective "Sudden".
Nearby Words: suddenly, suddenness
Mutual synonyms
Both words in one sentence
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Additionally it will either be an instant thing from a regular heartbeat to a line, or a very sudden series of erratic bleeps suggesting the patient is having a heart-attack, often from stress, just before the flatline itself.
Source: Flatline
Cite this Source
Sudden and Erratic. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/erratic/sudden
Erratic & Sudden. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/erratic/sudden>.
Sudden or Erratic. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/erratic/sudden.
Google Ngram Viewer shows how "erratic" and "sudden" have occurred on timeline