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Definition of undistinguishable
undistinguishable
/ˌʌn.dɪˈstɪŋ.ɡwɪ.ʃə.bəl/
un · dis · tin · guish · a · ble
Adverb:undistinguishably
undistinguishable Lexical Profile
CEFR
C1
Grade
11
Tier
2
Usage
Rare
• adjective
1
Not able to be identified as different or distinct; impossible to tell apart.
Example
"The two historical manuscripts were written in a script so uniform that their authors' hands were virtually undistinguishable."
2
Lacking clear boundaries, form, or definition; unable to be clearly perceived or made out.
Example
"Through the dense coastal fog, the distant lighthouse became an undistinguishable blur on the horizon."
Word Nuance & Usage
In modern English, 'indistinguishable' is strongly preferred over 'undistinguishable', which is now considered somewhat dated or literary.
• Rhymes for undistinguishable
• Nearby Words
Cite this Entry
Wordmom. (2026). Definition of Undistinguishable. In Wordmom Dictionary. Retrieved Nov 4, 2026, from https://wordmom.com/dictionary/undistinguishable