as in invisible
not perceptible by a sense or by the mind
a slight difference in hue between the two glasses that's imperceptible unless they're placed side by side
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Recent Examples of imperceptible
While imperceptible to humans, these tiny delays are significant for experiments that rely on pulsars as ultra-precise cosmic clocks, the researchers say, particularly efforts to detect low-frequency gravitational waves and to search for signs of intelligent life beyond Earth.
—
Sharmila Kuthunur, Space.com, 16 Jan. 2026
Our data about the Amundsen Sea’s past and the resulting forecast indicate that onshore changes in West Antarctica will not be slow, gradual or imperceptible from a human perspective.
—Keiji Horikawa, The Conversation, 22 Dec. 2025
But at some imperceptible moment, things shifted; suddenly black fins, white tails and entire submarinelike bodies were popping out of the water just a few hundred feet away.
—Kelso Harper, Scientific American, 16 Dec. 2025
In the middle distance imperceptible to language?
—Literary Hub, 8 Dec. 2025
See All Example Sentences for imperceptible
Sharmila Kuthunur, Space.com, 16 Jan. 2026
Our data about the Amundsen Sea’s past and the resulting forecast indicate that onshore changes in West Antarctica will not be slow, gradual or imperceptible from a human perspective.
—Keiji Horikawa, The Conversation, 22 Dec. 2025
But at some imperceptible moment, things shifted; suddenly black fins, white tails and entire submarinelike bodies were popping out of the water just a few hundred feet away.
—Kelso Harper, Scientific American, 16 Dec. 2025
In the middle distance imperceptible to language?
—Literary Hub, 8 Dec. 2025
See All Example Sentences for imperceptible
Recent Examples of Synonyms for imperceptible
Adjective
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That leaves thousands of families connected by an invisible thread of loss, uncertainty and unresolved grief.—
Chelsea Bailey,
CNN Money,
28 Mar. 2026
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Finding an invisible engine The mystery traces back to observations made by NASA’s Cassini in 2004, which suggested Saturn’s rotation rate was changing over time.—
Rupendra Brahambhatt,
Interesting Engineering,
28 Mar. 2026
Adjective
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Another camera, an eye tuned to the subtle strangeness of an otherwise ordinary day—someone or something, somewhere, must have caught a glimmer of the truth.—
Vinson Cunningham,
New Yorker,
1 Apr. 2026
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Vice President Vance, who is considered an isolationist, expressed private skepticism ahead of the attacks, and his relative silence during the first weeks of the war was perceived as a subtle way of distancing himself from the conflict.—
Jonathan Lemire,
The Atlantic,
1 Apr. 2026
Adjective
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The effects added even more variety to the light and texture of the dense foliage and rocks, making the depicted landscape indistinguishable from real-world photography.—
Michael Kan,
PC Magazine,
31 Mar. 2026
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The fresh precipitation had rendered the thin roads above Lake Tahoe almost indistinguishable from the frosted forests around them.—
Namir Khaliq,
Big Think,
31 Mar. 2026
Cite this Entry
“Imperceptible.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/imperceptible. Accessed 3 Apr. 2026.
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