A bite of wisdom

Which of these adjectives describes something very severe or dreadful?

Grandiose

Gracious

Gratuitous

Grievous

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grievous

1. (of something bad) very severe or serious

"his death was a grievous blow"

Choice "A": Grandiose % of users selected this choice.
Choice "B": Gracious % of users selected this choice.
Choice "C": Gratuitous % of users selected this choice.
Choice "D": Grievous % of users selected this choice.