To do so might be to provoke a scene; and a scene, in the shaken state of Mrs. Peniston’s nerves, with the effects of her dinner not worn off, and her mind still tremulous with new impressions, was a risk she deemed it her duty to avoid.
There are no more uses of "deemed" in the book.
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The producer deemed her too old to play the role.
The chemical was deemed unsafe to use in children’s products.