拙嘴笨舌

zhuōzuǐbènshé
lit. clumsy mouth and broken tongue (idiom); awkward speaker

CEDICT

Entry Composition

1 拙 zhuō
  1. awkward
  2. clumsy
  3. dull
  4. inelegant
  5. (polite) my
  6. Taiwan pr. zhuó
2 嘴笨 zuǐbèn inarticulate
3 舌 shé tongue