深信不疑 shēn xìn bù yí

DEFINITIONS

  1. to believe firmly without any doubt (idiom)
  2. absolute certainty about sth

CHARACTERS

深 shēn
HSK 4
deep; depth; far; very, extreme
信 xìn
HSK 3
trust, believe; letter
不 bù
HSK 1
no, not; un-; negative prefix
疑 yí
HSK 4
doubt, question, suspect