Portentous
Pronunciation : Por*tent"ous
Part of Speech : a.
Etymology : [L. portentosus.]
Definition : 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