Dictionary definition of portentous

1. The sudden and portentous arrival of the black cat was considered bad luck.
2. The portentous melody of the music foreshadowed a dramatic turn of events in the play.
3. The scientist's portentous discovery held the potential to revolutionize the field.
4. The protagonist's portentous dream set the tone for the events that followed.
5. The ancient manuscript was filled with portentous symbols that were difficult to decipher.
6. The portentous atmosphere in the graveyard added to the sense of foreboding.
7. The thunderous sound of distant drums had a portentous quality, signaling an impending ceremony.
8. The writer used portentous imagery to create a sense of impending doom in the story.
9. The portentous eclipse of the sun had an almost magical effect on the town's residents.
10. The clock's ticking grew more portentous as the deadline approached.
11. The historian uncovered a series of portentous events leading up to the decisive battle.
12. The politician's portentous promises during the campaign raised expectations among voters.
13. The opera singer's portentous voice resonated through the auditorium, captivating the audience.
14. The scientist's discovery of a new element was a portentous achievement in the field of chemistry.