Decline
Decline noun - A gradual sinking and wasting away of mind or body.
Failing is a synonym for decline in lessening topic. In some cases you can use "Failing" instead a noun "Decline", when it comes to topics like deterioration.
Mutual synonyms
How words are described
Both words in one sentence
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His momentum once again went on a slow decline once he founded his own label (Show Dog, which later merged with Universal South to become Show Dog-Universal), with more and more singles failing to reach Top 10.
Source: Career Resurrection
Cite this Source
Failing and Decline. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/decline/failing
Decline & Failing. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/decline/failing>.
Failing or Decline. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/decline/failing.
Google Ngram Viewer shows how "decline" and "failing" have occurred on timeline