唯一無二 (ゆいいつむに) Japanese meaning | KotomoraMeanings
1
noun which may take the genitive case particle 'no', na-adjective, noun
one and only; unique; unparalleled
yojijukugo (four-character idiom)
Emphasizes absolute uniqueness; there is nothing else like it. Often used in formal or emphatic contexts.
This work has unparalleled value.