UNOBSERVABLE Synonyms: 39 Similar and Opposite Words

unobservable

adjective

Definition of unobservable

as in imperceptible

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Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of unobservable These unobservable behaviors may be among the most important for educators. — Dan Fitzpatrick, Forbes.com, 23 Feb. 2026 But responsibility diffuses across developers, deployers, and users, and interaction loops remain private and unobservable. — Deb Roy, The Atlantic, 15 Feb. 2026 So, within standard general relativity, Einstein–Rosen bridges are unstable and unobservable. — Rupendra Brahambhatt, Interesting Engineering, 17 Jan. 2026 Its nucleus is also far bigger than other notable comets, while its arrival time was fine-tuned to bring it within tens of millions of kilometers from Mars, Venus and Jupiter and be unobservable from Earth at perihelion, along with other unexpected properties. — Hannah Millington, MSNBC Newsweek, 30 Oct. 2025 See All Example Sentences for unobservable

Recent Examples of Synonyms for unobservable

Adjective

Telescopes do not stay perfectly still, so nearly imperceptible changes caused by wobbling alter the resulting images of starlight.

— Adam Harrington, CBS News, 4 Nov. 2026
Instead, his team developed SynthID, an imperceptible, incorruptible digital watermark now stamped to anything generated by Google AI, but also OpenAI, Nvidia, Kakao, and, soon, Apple.

— Daniel Varghese, Time, 15 Oct. 2026

Definition of imperceptible

Adjective

On a wallpaper image of a scarlet macaw, for example, the bird's red feathers bled into the white of its face, while the leafy green background looked grayish and indistinct.

— Marshall Honorof, PC Magazine, 7 Nov. 2026
And then the sun slips above the horizon, and in an instant the shadows turn from indistinct gray blurs to sharp black lines.

— Literary Hub, Literary Hub, 21 Oct. 2026

Definition of indistinct

Adjective

What may have been an unnoticeable work-around at five clients has a greater impact on the company’s day-to-day operations at 50 clients.

— Farzana Abdulhusein, Forbes.com, 4 Sep. 2026
But the spinning trick has real limits that make this drone far from being completely unnoticeable.

— New Atlas, New Atlas, 17 July 2026

Definition of unnoticeable

Browse Nearby Words

unobjectionable

unobservable

unobstructed

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“Unobservable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unobservable. Accessed 14 Nov. 2026.

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Synonyms of unobservable

adjective

Example Sentences

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