Decay
Decay noun - A gradual sinking and wasting away of mind or body.
Usage example: middle-aged people who fervently hope that daily exercise will arrest the physical decay that usually accompanies advancing age
Regression and decay are semantically related. In some cases you can use "Regression" instead a noun "Decay".
Regression
Regression noun - The act or an instance of going back to an earlier and lower level especially of intelligence or behavior.
Decay and regression are semantically related. Sometimes you can use "Decay" instead a noun "Regression".
Mutual synonyms
Cite this Source
Regression and Decay. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/decay/regression
Decay & Regression. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/decay/regression>.
Regression or Decay. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/decay/regression.
Google Ngram Viewer shows how "decay" and "regression" have occurred on timeline