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The Collaborative International Dictionary
Portentousness

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. [1913 Webster] -- Por*tent"ous*ly, adv. -- Por*tent"ous*ness, n.

Wiktionary
portentousness

n. The quality of being portentous

Usage examples of "portentousness".

Simon pursued, with a somewhat Countly portentousness, "that the reason why it begins to be said that your Florida waters are fished outis that they are.