渾然一體

浑然一体
húnrányītǐ
  1. to blend into one another
  2. to blend together well

CEDICT

to be one integrated mass; to be a unified entity

Wiktionary

融成一體，完整不可分。

重編國語辭典

Entry Composition

1 渾然 húnrán
  1. completely
  2. absolutely
  3. undivided
  4. totally mixed up
  5. muddled
2 一體 yītǐ
  1. an integral whole
  2. all concerned
  3. everybody