1. (adjective) slow to learn or understand; lacking intellectual acuity

• dense
• dim
• dull
• obtuse
• slow

2. (adjective) temporarily incapable of speaking

• speechless

3. (adjective) unable to speak because of hereditary deafness

• mute
• silent

1. (adjective) slow to learn or understand; lacking intellectual acuity

• stupid

2. (adjective) temporarily incapable of speaking

• inarticulate
• unarticulate

3. (adjective) lacking the power of human speech

• inarticulate
• unarticulate

4. (adjective) unable to speak because of hereditary deafness

• inarticulate
• unarticulate

1. (adjective) slow to learn or understand; lacking intellectual acuity

• awkwardness
• clumsiness
• ineptitude
• ineptness
• maladroitness
• slowness
• backwardness
• mental retardation
• retardation
• slowness
• subnormality
• denseness
• denseness
• dumbness
• dumbness
• slow-wittedness
• slow-wittedness
• dullness
• dullness
• obtuseness
• obtuseness

2. (adjective) temporarily incapable of speaking

• speechlessness

3. (adjective) unable to speak because of hereditary deafness

• deaf-and-dumb person
• deaf-mute
• mute
• muteness
• mutism