PORTENTOUSLY
portentously
(adverb) in a portentous manner; “portentously, the engines began to roll”
Source: WordNet® 3.1
Etymology
Adverb
portentously (comparative more portentously, superlative most portentously)
In an ominous manner.
Synonym: ominously
In a pompous manner.
Source: Wiktionary
PORTENTOUS
Por*tent"ous, a. Etym: [L. portentosus.]
1. Of the nature of a portent; containing portents; foreschadowing,
esp. foreschadowing ill; ominous.
For, I believe, they are portentous things. Shak.
Victories of strange and almost portentous splendor. Macaulay.
2. Hence: Monstrous; prodigious; wonderful; dreadful; as, a beast of
portentous size. Roscommon.
– Por*tent"ous*ly, adv.
– Por*tent"ous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition