portentous
used in Middlemarch

only 1 use

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Definition

very important; or indicating something important in the future

or:

acting overly important or serious

But by-and-by Nancy, in her attic, became portentously worse, the supposed tumor having indeed given way to the blister, but only wandered to another region with angrier pain.
Book 5 — The Dead Hand (19% in)

There are no more uses of "portentous" in Middlemarch.

Typical Usage (best examples)