indistinguishable

adjective

in·​dis·​tin·​guish·​able ˌin-di-ˈstiŋ-gwi-shə-bəl 

-ˈstiŋ-wi-

: not distinguishable: such as

a

: lacking identifying or individualizing qualities

seemingly indistinguishable alternatives

The copy is practically indistinguishable from the original.

b

: not clearly recognizable or understandable

indistinguishable differences

c

: indeterminate in shape or structure

indistinguishable forms in the mist

indistinguishability

ˌin-di-ˌstiŋ-gwi-shə-ˈbi-lə-tē 

-ˌstiŋ-wi-

noun

indistinguishableness

ˌin-di-ˈstiŋ-gwi-shə-bəl-nəs 

-ˈstiŋ-wi-

noun

indistinguishably

ˌin-di-ˈstiŋ-gwi-shə-blē 

-ˈstiŋ-wi-

adverb

Synonyms of indistinguishable

• invisible
• imperceptible
• subtle

Examples of indistinguishable in a Sentence

indistinguishable differences that can be measured only electronically

indistinguishable shapes in the fog

Recent Examples on the Web

In this way, pseudorandom numbers can be generated, which, in the best case, are indistinguishable from truly random numbers. — Manon Bischoff, Scientific American, 25 Aug. 2026

From a cybersecurity perspective, the entire transaction appears normal and is indistinguishable from a potential threat. — Morey Haber, Forbes.com, 20 Aug. 2026

In a video of the evacuation Enciso pulled up on his phone, Ravenswood streets are indistinguishable from the adjacent waterway – save for cars and rooftops poking up through the flood. — Sophie Hartley, IndyStar, 15 Aug. 2026

But, in the event of a glitch, transporter rooms effectively become highly sophisticated 3D printers, creating duplicates indistinguishable from the original beamee. — Richard Edwards, Space.com, 13 Aug. 2026

Word History

First Known Use

1606, in the meaning defined above

Rhymes for indistinguishable

• distinguishable
• inextinguishable
• undistinguishable

Kids Definition

indistinguishable

adjective

in·​dis·​tin·​guish·​able ˌin-dis-ˈtiŋ-gwish-ə-bəl 

: impossible to distinguish clearly