Definition of "unnaturally"

Another, with the bump of order unnaturally developed, had his folios and quartos all reduced, in binding, to one size, so that they might look even on his bookshelves.

1902, William Blades, The Enemies of Books, 2nd edition, page 102

Not unnaturally, “Auntie” took this communication in bad part. Thus outraged, she showed herself to be a bold as well as a furious virago. Next day she found her way to their lodgings and tried to recover her ward by the hair of the head.

1918, W[illiam] B[abington] Maxwell, chapter XXII, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company