un·​ob·​serv·​able ˌən-əb-ˈzər-və-bəl How to pronounce unobservable (audio)
: incapable of being observed : not observable
particles so small that they are unobservable

Examples of unobservable in a Sentence

Recent Examples on the Web For Davies, the potential to test the effect could open up exciting new doors for both theoretical and applied physics, further validating nigh-unobservable phenomena predicted by theorists while expanding the tool kit experimentalists can use to interrogate nature. Joanna Thompson, Scientific American, 20 May 2022 The team say that a noise level of just 50ppm would make the technosignature unobservable, regardless of how long the observatory studied Trappist-1e. The Physics Arxiv Blog, Discover Magazine, 28 Feb. 2022 By the start of this era, the mysterious substance acting in opposition to gravity called dark energy will have driven everything in the universe apart so much that each individual black dwarf would be surrounded by vast darkness: The supernovae would even be unobservable to each another. Adam Mann, Science | AAAS, 11 Aug. 2020 Our capacity for moral reasoning shouldn't depend on what's happening many googols of parsecs away in an unobservable part of the universe. Sean Carroll, Discover Magazine, 11 Feb. 2011 The hyper-expansion of space would not affect the local laws of physics, and any objects receding faster than light would be fundamentally unobservable and hence irrelevant. Corey S Powell, Discover Magazine, 1 May 2013 Staff at the institute, which operates the revolutionary telescope, have put the finishing touches on the public’s first look at the power of Webb to observe what was once unobservable — distant galaxies, the atmospheres of faraway planets. Christine Condon, Baltimore Sun, 11 July 2022 However, some voices in the reader mail have taken me to task for emphasizing maximum range, when—like 0-60 mph acceleration and top speed—the standard is nearly unobservable on a daily basis and therefore irrelevant for the vast majority of users. Dan Neil, WSJ, 22 Apr. 2022 That’s because the helium-3 nucleus moves so little that its motion is essentially unobservable, and the neutrino can’t be detected. Don Lincoln, Forbes, 18 May 2021

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'unobservable.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1615, in the meaning defined above

Time Traveler
The first known use of unobservable was in 1615

Dictionary Entries Near unobservable

Cite this Entry

“Unobservable.” Dictionary, Merriam-Webster, Accessed 17 Apr. 2024.

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