1. the quality or state of being spread out over a large area or scattered; lack of concentration or compactness
2. the quality of being wordy, unclear, or lacking focus in expression or writing

Examples

• The diffuseness of the light through the frosted glass created a soft, even glow.
• The professor criticized the diffuseness of the student's essay, which wandered from topic to topic.
• The diffuseness of the population across rural areas made census-taking difficult.
• Her writing suffered from diffuseness; she used ten words where two would suffice.
• The diffuseness of the fog made it impossible to see more than a few feet ahead.
• The committee's diffuseness in defining the project goals led to confusion among team members.