滴水不漏

dīshuǐbùlòu
  1. lit. not one drop of water can leak out
  2. watertight
  3. rigorous (argument)

CEDICT

completely rigorous; watertight; very tight

Wiktionary

周密細緻，無一疏漏。

重編國語辭典

Entry Composition

1 滴水 dīshuǐ
  1. water drop
  2. dripping water
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 漏 lòu
  1. to leak
  2. to divulge
  3. to leave out by mistake
  4. waterclock or hourglass (old)

Related entries

不透水 bùtòushuǐ
  1. waterproof
  2. watertight
  3. impermeable
點水不漏 diǎnshuǐbùlòu
  1. not one drop of water leaks (idiom); fig. thoughtful and completely rigorous
  2. watertight
謹嚴 jǐnyán
  1. meticulous
  2. rigorous
嚴峻 yánjùn
  1. grim
  2. severe
  3. rigorous
嚴 yán
  1. tight (closely sealed)
  2. stern
  3. strict
  4. rigorous
  5. severe
  6. father
他被严历批评。

He was harshly criticized.

He was harshly criticised.

He underwent severe criticism.

Source: Tatoeba