沉默寡言

chénmòguǎyán
  1. habitually silent (idiom)
  2. reticent
  3. uncommunicative

CEDICT

taciturn; reticent; to be of few words

Wiktionary

性情沉靜，很少說話。

重編國語辭典

性情沉靜而少說話

維基詞典

Entry Composition

1 沉默 chénmò
  1. taciturn
  2. uncommunicative
  3. silent
2 寡言 guǎyán
  1. taciturn
  2. reticent

Related entries

守口如瓶 shǒukǒurúpíng
  1. lit. to guard one's mouth like a closed bottle (idiom); tight-lipped
  2. reticent
  3. not breathing a word
寡言 guǎyán
  1. taciturn
  2. reticent
拘束 jūshù
  1. to restrict
  2. to restrain
  3. constrained
  4. awkward
  5. ill at ease
  6. uncomfortable
  7. reticent
沉默 chénmò
  1. taciturn
  2. uncommunicative
  3. silent
男孩依旧沉默不语。

The boy remained silent.

Source: Tatoeba