Fundamental
Fundamental adjective - Of or relating to the simplest facts or theories of a subject.
Old and fundamental are semantically related. In some cases you can use "Old" instead an adjective "Fundamental".
Old
Old adjective - Being of advanced years and especially past middle age.
Fundamental and old are semantically related. Sometimes you can use "Fundamental" instead an adjective "Old".
Mutual synonyms
Both words in one sentence
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The premise of Total Annihilation is a millennia-old war over a fundamental difference in philosophy, and all diplomatic alternatives have presumably been extinguished long ago.
Source: Violence Is the Only Option -
On a more fundamental level, Chryssalid's didn't cope well with the transition from the old "Action Unit" system to the new "one move, one attack per turn" action system.
Source: Video Game / XCOM: Enemy Unknown -
The Borg Queen is revealed to be a mere puppet of the fundamental drives at the heart of the collective - and then unsubverted, because the drives at the heart of the collective are derived from the millenia-old remnants of the personality of Inyx's ex-wife.
Source: Literature / Star Trek: Destiny
Cite this Source
Old and Fundamental. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/fundamental/old
Fundamental & Old. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/fundamental/old>.
Old or Fundamental. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/fundamental/old.
Google Ngram Viewer shows how "fundamental" and "old" have occurred on timeline