Definitions:

1. A state of being foolish, ignorant, or lacking wisdom; lack of intelligence or understanding. NOUN
   • His dumbness in ignoring the warning led to trouble.
2. Being unable to speak due to shock, confusion, or surprise. NOUN
   • Her dumbness in the moment was due to sheer amazement.

Synonyms:

• astonishment
• Foolishness
• ignorance
• speechlessness