True
True adjective - Being exactly as appears or as claimed.
Underlying and true are semantically related. In some cases you can use "Underlying" instead an adjective "True".
Underlying
Underlying adjective - Of or relating to the simplest facts or theories of a subject.
True and underlying are semantically related. Sometimes you can use "True" instead an adjective "Underlying".
Both words in one sentence
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Most theories have a foundation of underlying premises (the aforementioned "entities"), all of which need to be true for the theory itself to be true.
Source: Occam's Razor -
Arguably, an underlying theme throughout the Elder Scrolls series is that different, contradictory mythologies are all simultaneously true.
Source: Crossover Cosmology - In the Marvel Universe, a number of fringe theories are quite true, including the Counter-Earth idea and the underlying explanation of nearly all non-magical superpowers deriving from Jack Kirby's use of Ancient Astronauts in the 1970s series The Eternals.
Source: All Theories Are True
Cite this Source
Underlying and True. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/true/underlying
True & Underlying. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/true/underlying>.
Underlying or True. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/true/underlying.
Google Ngram Viewer shows how "true" and "underlying" have occurred on timeline