1. the quality or state of being openmouthed; astonishment or surprise expressed with the mouth open
Usage: informal; typically uncountable
2. the quality of being frank, candid, or outspoken; lack of reserve in speech
Usage: informal; typically uncountable

Examples

• The openmouthedness of the audience was evident when the magician revealed his final trick.
• Her openmouthedness about her personal life sometimes got her into trouble at work.
• The children stared in openmouthedness at the enormous dinosaur skeleton in the museum.
• His openmouthedness made him a poor diplomat; he said whatever came to mind.
• The openmouthedness on their faces showed they had not expected such a dramatic announcement.
• She appreciated his openmouthedness and honesty, even when his words were harsh.