一絲不苟 yī sī bù gǒu

DEFINITIONS

  1. not one thread loose (idiom); strictly according to the rules
  2. meticulous
  3. not one hair out of place

CHARACTERS

一 yī
HSK 1
one; a, an; alone
絲 sī silk; fine thread; wire; strings
不 bù
HSK 1
no, not; un-; negative prefix
苟 gǒu
HSK 6
careless, frivolous; illicit; grammatical particle: if, but, if only; surname; grass name; distinguish DKW 30853 (ji4)