dumb

• (s) slow to learn or understand; lacking intellectual acuity
  • so dense he never understands anything I say to him
  • never met anyone quite so dim
  • "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray
  • dumb officials make some really dumb decisions
  • he was either normally stupid or being deliberately obtuse
  • worked with the slow students
  slow, dense, obtuse, dim, dull,
• (s) temporarily incapable of speaking
  • struck dumb
  • speechless with shock
  speechless,
• (s) lacking the power of human speech
  • dumb animals
• (s) unable to speak because of hereditary deafness mute, silent,

Synonyms

Words of close approximity