portentous
adjective uk/pɔːˈten.təs/ us/pɔːrˈten.t̬əs/
formal disapproving自命不凡的，自大的;装模作样的
too serious and trying to be very important
The problem with the book is that it sometimes descends into portentous philosophizing. 这本书的问题在于它有时陷入了自命不凡的高谈阔论。
literary预兆的，凶兆的
Portentous events, statements, or signs are important because they show that something unpleasant is very likely to happen
The report contains numerous portentous references to a future environmental calamity. 报告里有很多地方预兆性地提到了将来的环境灾难。