Wiktionary
understatedly
adv. In an understated way.
Usage examples of "understatedly".
Jimmy was understatedly resplendent in thin fawn polo-necked sweater under a navy blue blazer.
And here I was about to enter one of the most beautiful and understatedly romantic of them all: Jackson Hole.
His suit, shirt, and tie were exquisite, and he was understatedly elegant in his accessories.