adj.预示性的，预示(坏事)的，先兆的，煞有介事的，装腔作势的，装模作样的

The portentous storm clouds gathered on the horizon, signaling an impending disaster.
庞大的乌云聚集在地平线上，预示着即将来临的大灾难。
His portentous silence made everyone uneasy in the room.
他那庄重的沉默让房间里的人都感到不安。
The announcement of the royal wedding was met with portentous excitement.
对于王室婚礼的宣布，人们怀着庄重而激动的心情。
Her portentous words hung in the air, leaving a profound impact on the listeners.
她那些意味深长的话语在空气中回荡，给听众留下了深刻的印象。
The ancient prophecy seemed portentous, foretelling a great upheaval in the kingdom.
古老的预言显得意味深长，预示着王国将发生巨大的动荡。
The portentous decision to close the factory led to widespread unemployment.
关闭工厂的决定具有重大影响，导致了大规模的失业。
The portentous moment arrived when they stepped into the grand cathedral for the solemn ceremony.
当他们踏入宏伟的大教堂参加庄严的仪式时，那个重要的时刻到来了。
His portentous gaze made her feel as though she were under a microscope.
他那庄重的目光让她觉得自己仿佛被置于显微镜下。
The portentous silence after the explosion was more terrifying than the blast itself.
爆炸后的沉寂比爆炸本身更令人恐惧。
The historian described the fall of the empire as a portentous turning point in history.
历史学家将帝国的衰落描述为历史上一个具有深远影响的转折点。