Portentous

Part of speech: adjective (a.)

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.