- 一丝不苟 yīsībùgǒu meticulousstrictly according to the rules; very conscientious and careful, neglecting no detail
- 一丝丝 yīsīsī a tiny bita tiny amount; a trace; very little
- 一丝不挂 yīsībùguà stark naked(idiom) not wearing a single thread; without a stitch of clothing; in one's birthday suit
- 一丝一毫 yīsīyīháo a tiny bit(idiom) a tiny bit; an iota; a trace; extremely minute
- 一丝不乱 yīsībùluàn meticulousarranged in perfect order; meticulous and precise to the smallest detail; not a hair out of place