MDBG: not one thread loose (idiom); strictly according to the rules; meticulous; not one hair out of place
LDC: meticulosity
CDict: '
Click icons for complete source definitions (not available on mobile). icon in each entry gives source attribution. Want to improve this definition? Check to see if 一丝不苟 is already in CC-CEDICT. If not, you can add it. (Why?)