独一无二

獨一無二
dúyīwúèr
(idiom) unique; unmatched; unrivalled

CEDICT

Entry Composition

1 独一 dúyī
  1. only
  2. unique
2 无 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
3 二 èr
  1. two
  2. 2
  3. (Beijing dialect) stupid