纯属

純屬
chúnshǔ
  1. to be purely
  2. pure and simple
  3. sheer
  4. outright

CEDICT

to belong completely to; to be completely

Wiktionary

Entry Composition

1 纯 chún
  1. pure
  2. simple
  3. unmixed
  4. genuine
2 属 shǔ
  1. category
  2. genus (taxonomy)
  3. family members
  4. dependents
  5. to belong to
  6. subordinate to
  7. affiliated with
  8. be born in the year of (one of the 12 animals)
  9. to be
  10. to prove to be
  11. to constitute