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

Cibus scientists were changing genetic building blocks, and the outcome was indistinguishable from what exists in nature. —Noelle Harff, San Diego Union-Tribune, 23 May 2026

Those who interacted with the chatbot reported loneliness levels statistically indistinguishable from those who simply journaled. —Clay Routledge, Fortune, 23 May 2026

The problem is that at sufficient scale, efficiency and concentration become indistinguishable. —Ivan Kan, Forbes.com, 22 May 2026

The mushrooms are indistinguishable in appearance and taste from edible mushrooms, and can be found growing among them. —Sean Campbell, Sacbee.com, 20 May 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