口訥

口讷
kǒunè
(literary) inarticulate

CEDICT

literary

Entry Composition

1 口 kǒu
  1. mouth
  2. classifier for things with mouths (people, domestic animals, cannons, wells etc)
  3. classifier for bites or mouthfuls
2 訥 nè
  1. to speak slowly
  2. inarticulate