Similar words: portentous, fortuitously, portent, sententiously, ostentatiously, portend, riotously, courteously. Meaning: [pɔr'tentəs /pɔː't-] 
adv. in a portentous manner.
adv. in a portentous manner. 
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1. She frowned portentously to add weight to her suggestion.
2. 'No good will come of this,' she announced portentously.
3. The lamps had a portentously elastic swing with them.
4. Portentously, the engines began to roll.
5. Halberstam paragraph usually filled a page, unfolding portentously towards some great quotation that glimmered in the final line.
6. "The dif-ference is," he said portentously, "you are Anglo-Saxons, we are Latins."
7. "Yes, Mr. Marx, " said the Director portentously. "I did ask you to come to me here.
8. First they declare portentously that the European club is in deep "crisis" and unable to function.
9. Louis surveyed me with his shrewd gray eyes and shook his head portentously.
More similar words: portentous, fortuitously, portent, sententiously, ostentatiously, portend, riotously, courteously, tenaciously, momentous, conscientiously, porter, supporter, reporter, contorted, shorten, piously, reportedly, callously, purportedly, shortened, copiously, tediously, jealously, furiously, zealously, viciously, curiously, enormously, dubiously.