1. the quality of being portentous; the state of being ominous, threatening, or foreboding.
Usage: abstract noun derived from the adjective 'portentous'
2. the quality of being solemn, serious, or self-importantly dignified in manner or speech.
Usage: often used to describe affected or exaggerated seriousness

Examples

• The portentousness of the storm clouds made everyone nervous.
• She spoke with such portentousness that no one dared interrupt her.
• The portentousness of his tone suggested something terrible was about to happen.
• He delivered the news with unnecessary portentousness, turning a simple announcement into a dramatic event.
• The portentousness of the ancient prophecy haunted the villagers for generations.
• Despite the portentousness of the situation, she remained calm and collected.