"Well now, I dunno," said Matthew, who, being patient and wise and, above all, hungry, had deemed it best to let Marilla talk her wrath out unhindered, having learned by experience that she got through with whatever work was on hand much quicker if not delayed by untimely argument.
There are no more uses of "deemed" in the book.
Show samples from other sources
The producer deemed her too old to play the role.
The chemical was deemed unsafe to use in children’s products.