ad. 前兆地
不吉地

[ adv ]
in a portentous manner
<adv.all>
portentously, the engines began to roll

Portentous \Por*tent"ous\, a. [L. portentosus.]
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. --Roscommon.
※ -- {Por*tent"ous*ly}, adv. --
{Por*tent"ous*ness}, n.