portentously

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por·ten·tous

P0455900 (pôr-tĕn′təs)adj.1. Of the nature of or constituting a portent; foreboding: "The present aspect of society is portentous of great change" (Edward Bellamy).2. Full of unspecifiable significance; exciting wonder and awe: "Such a portentous and mysterious monster roused all my curiosity" (Herman Melville).3. Marked by pompousness; pretentiously weighty.
por·ten′tous·ly adv.por·ten′tous·ness n.Usage Note: The last syllable of portentous is properly pronounced (-təs). However, under the influence of words like contentious and pretentious, sometimes this word is pronounced (pôr-tĕn′shəs), as though it were spelled portentious. Both the (-shəs) pronunciation and the spelling with the i (which is occasionally seen in print) are widely considered to be mistakes.
Thesaurus
Adv.1.portentously - in a portentous manner; "portentously, the engines began to roll"
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