American Heritage Dictionary
(3)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
The franchise trademarks -- portentous dialogue, pointless mythologizing, and wholesale cribbing from other stories -- remain, but dressed up in medieval armor and splattered with blood, they become surprisingly enjoyable, crossing the B-movie line from leaden over to almost zesty.— Filmcritic.com Movie Reviews
When you saw the ring on his finger only, the circumstance was pregnant--portentous.— The Paternoster Ruby
It sounded doubtless, and of a sudden, a little portentous--as was in fact testified to by his lordship's quick stiff stare, full of wonder at so free a note.— The Outcry
To his wife this unnatural joy was portentous--she remembered that he had been like this just before little Willie died.— Life of Abraham Lincoln Little Blue Book Ten Cent Pocket Series No. 324
Some considered it as a portentous omen of the wrath of Heaven in vengeance denounced against the land, others as the immediate harbinger of the last day, when 'the sun shall be darkened, and the moon shall not give her light Not only over the land, but out at sea also, the unnatural darkness of the day and night of May 19, 1780, was observed.— Our Day In the Light of Prophecy

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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