Stiltedly is the adverb of stilted: doing something — usually speaking, reading aloud, or writing — in a stiff, over-formal, unnatural way, so that the effort shows. "He spoke stiltedly," "she read the announcement stiltedly," "they greeted each other stiltedly." Everything true of stilted is true here. The problem is not formality itself but formality that does not fit the moment, so the language sounds forced and does not flow. It is always mildly critical. But be honest about how rare it is. This is a real word and you will find it in a dictionary, but even native writers reach for it only occasionally. In practice they far more often write "in a stilted way" or "stiffly," or rebuild the sentence around the adjective: "his speech was stilted." You will meet stiltedly perhaps once a year in reading — in a novel, a review, a careful essay. So the honest advice is: know it when you see it, and let the adjective do your own work. That is not a failing in you; it is how the word behaves for everybody.

生硬地、做作地（相當於「用生硬的方式」，實際上少用）