Portentous (adjective)

1. Foreshadowing or indicating a significant event or occurrence, especially an ominous or ominous one.
2. Having a serious or weighty quality or appearance.

Origin:

The word 'portentous' comes from the latin word 'portentum', meaning an omen or a sign of something to come. it has been used in english since the mid-16th century to describe something that foreshadows or indicates a significant event.

Examples:

1. The storm clouds gathering on the horizon were a portentous sign of the approaching disaster.
2. The portentous silence in the room was broken only by the sound of the grandfather clock ticking.
3. She looked at him with portentous eyes, as if she was trying to tell him something.
4. The portentous tone of the news anchor's voice indicated that the story was going to be a serious one.
5. The portentous notes of the funeral march signaled the beginning of the procession.