DICT.TW Dictionary Taiwan

 portentously
 (ad.)前兆地;不吉地

 Por·tent·ous a.
 1. Of the nature of a portent; containing portents; foreshadowing, esp. foreshadowing 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.
 -- Por*tent*ous*ly, adv. -- Por*tent*ous*ness, n.
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 portentously
      adv : in a portentous manner; "portentously, the engines began to
            roll"