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.
"What would previously have been indistinguishable from random noise can thus become a clear signal."
From Science Daily ● Sep. 13, 2026
The RAV4 PHEV’s EV mode was completely transparent; that is to say, all but indistinguishable from the operation of a regular battery-electric.
From The Wall Street Journal ● Aug. 1, 2026
Many of the items, though, were indistinguishable, draped in black wrappings or in wooden boxes.
From BBC ● Jul. 1, 2026
“Backrooms,” from 21-year-old Kane Parsons — known on YouTube as Kane Pixels — drew on an online fascination with liminal spaces, leading audiences through an endless run of nearly indistinguishable rooms.
From Los Angeles Times ● Jun. 20, 2026
At first she’s repeating give her to me, give her to me, but then it’s just an indistinguishable howl of fury and anguish.
From "The Girl on the Train" by Paula Hawkins
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.
