por·ten·tous 
/poɚˈtɛntəs/ adjective
/poɚˈtɛntəs/ adjective [more portentous; most portentous] 1 formal + literary : giving a sign or warning that something usually bad or unpleasant is going to happen
▪ a portentous dream/event 2 formal + disapproving : trying to seem important, serious, or impressive : pompous
▪ a portentous manner/tone
▪ a portentous dream/event
▪ a portentous manner/tone
— por·ten·tous·ly adverb
