敢怒而不敢言

gǎnnùérbùgǎnyán
  1. angry, but not daring to speak out (idiom); obliged to remain silent about one's resentment
  2. unable to voice objections

CEDICT

心裡非常生氣，但因畏懼受到懲罰，而不敢表現出來。

重編國語辭典

Entry Composition

1 敢 gǎn
  1. to dare
  2. daring
  3. (polite) may I venture
2 怒 nù
  1. anger
  2. fury
  3. flourishing
  4. vigorous
3 而 ér
  1. and
  2. as well as
  3. and so
  4. but (not)
  5. yet (not)
  6. (indicates causal relation)
  7. (indicates change of state)
  8. (indicates contrast)
4 不敢 bùgǎn
  1. (regional) cannot; must not; should not
  2. You flatter me; I wouldn't presume; I don't deserve this (praise, reward, etc.)
  3. cannot; must not; should not
  4. to not dare (to do something)
5 言 yán
  1. words
  2. speech
  3. to say
  4. to talk