indistinguishable
Americanadjective
-
not distinguishable.
-
indiscernible; imperceptible.
adjective
-
identical or very similar (to)
twins indistinguishable from one another
-
not easily perceptible; indiscernible
Other Word Forms
Etymology
Origin of indistinguishable
First recorded in 1600–10; in- 3 + distinguishable ( def. )
Explanation
If you can't tell the difference between two things, they're indistinguishable — they appear the same. Although their parents can tell them apart, identical twins are indistinguishable to most people. It's easy to see which of two bills is worth twenty dollars and which is Monopoly money, but a professionally counterfeited bill is indistinguishable from a real one. One of the earliest uses of this word was by Shakespeare around 1600, when he gave it the meaning "of indeterminate shape." The definition evolved, first to "not clearly perceived," and then finally to "incapable of being told apart."
Vocabulary lists containing indistinguishable
Talk Like Shakespeare Day, List 1
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Brave New World
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Words with 15 or More Letters, List 1
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Yet he had the moral and artistic integrity—the two are indistinguishable, she writes—to tell the bitter truth.
From The Wall Street Journal • May 22, 2026
If you like your music windswept and overblown, this is for you - but it's indistinguishable from every other windswept and overblown Eurovision entry that's faltered in the semi-finals since 2020.
From BBC • May 8, 2026
Your TV and smartphone are far more interoperable and indistinguishable than ever before, and an inescapable user-tracking singularity is developing, accordingly, in your own living room.
From Slate • May 3, 2026
A follow-up study in 2024 involving Flinders, Greifswald, and McMaster Universities showed that antibodies from vaccine-related and infection-related cases were indistinguishable.
From Science Daily • Apr. 10, 2026
Already in the seventeenth century the mathematicians’ revolution was becoming indistinguishable from a mechanical revolution.
From "The Invention of Science" by David Wootton
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
