Eternal
Mutual synonyms
Both words in one sentence
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Eternal Darkness had the lead character Alex unlock an old safe through the use of a 200-year-old Stethoscope.
Source: Safecracking - In the Commonwealth Saga/Void Trilogy, regeneration allows essentially eternal life - so the centuries old aristocracy maintains the general vernacular.
Source: Eternal English - In an old story in the original Spider-Man comics, the villain Silvermane (with the help of Doctor Connors/The Lizard) decodes a tablet that has the secret to eternal youth on it.
Source: Merlin Sickness
Cite this Source
Old and Eternal. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/eternal/old
Eternal & Old. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/eternal/old>.
Old or Eternal. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/eternal/old.
Google Ngram Viewer shows how "eternal" and "old" have occurred on timeline