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Webster 1828 Edition

adv.

In a contented manner; quietly; without concern.

contentedly ‎(comparative more contentedly, superlative most contentedly)

In a contented manner.
- 1918, W. B. Maxwell, chapter 7, in The Mirror and the Lamp:
  “[…] This is Mr. Churchill, who, as you are aware, is good enough to come to us for his diaconate, and, as we hope, for much longer; and being a gentleman of independent means, he declines to take any payment.” Saying this Walden rubbed his hands together and smiled contentedly.