不知分寸

bùzhīfēncùn

to lack tact; to have no sense of propriety

Wiktionary

Entry Composition

1 不知 bùzhī
  1. not to know
  2. unaware
  3. unknowingly
  4. fig. not to admit (defeat, hardships, tiredness etc)
=2 分寸 fēncun
  1. propriety
  2. appropriate behavior
  3. proper speech or action
  4. within the norms
=2 分寸 fēncùn
  1. (figurative) sense of propriety; proper limits (of decorum, speech, behaviour, etc.)
  2. (figurative) small; little; insignificant; negligible
  3. (literally) fen and cun, two ancient Chinese units of length
  4. fen and cun, two ancient Chinese units of length
  5. sense of propriety; proper limits (of decorum, speech, behaviour, etc.)
  6. small; little; insignificant; negligible