FreeVocabulary
Portentous
/pɔːrˈtɛn.təs/ adjective hardSomething portentous carries a heavy sense of foreboding, as if it were a sign of a significant event to come.
Dark clouds gathered in a portentous swirl just as the negotiations began to collapse.
Memory Trick
Portentous contains 'portent,' meaning omen - a portentous sky is one loaded with omens of what's coming.