Old
Old adjective - Being of advanced years and especially past middle age.
Unchanging and old are semantically related. In some cases you can use "Unchanging" instead an adjective "Old".
Unchanging
Unchanging adjective - Not undergoing a change in condition.
Old and unchanging are semantically related. Sometimes you can use "Old" instead an adjective "Unchanging".
Nearby Words: unchangeable, unchanged
Mutual synonyms
Both words in one sentence
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When you are so old that no one, including yourself and your fellow Immortals, remembers a time when you did not exist in your current form, and when you are at the same time eternally youthful and unchanging, fidelity is inevitably going to be more of a challenge than for ordinary mortals.
Source: Really Gets Around -
In the Discworld novel Pyramids, the pyramids act as "time dams", preserving the Old Kingdom unchanging for thousands of years.
Source: Pyramid Power
Cite this Source
Unchanging and Old. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/old/unchanging
Old & Unchanging. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/old/unchanging>.
Unchanging or Old. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/old/unchanging.
Google Ngram Viewer shows how "old" and "unchanging" have occurred on timeline