IPA: /ʌnˈneɪməbl/
KK: /ʌnˈneɪməbl/
Something that cannot be named or identified.
The artist created an unnameable feeling in his painting that left viewers in awe.
Unnameable → It is formed from "un-" (meaning not) and "name" (from Old English "nama", meaning a word by which a person or thing is known) and "-able" (meaning capable of). The word "unnameable" means not capable of being named or without a name.
Think of 'not' ('un-') being added to 'name' — this helps you remember that 'unnameable' refers to something that cannot be named.