She repeated the same complaints tiresomely, making everyone annoyed.

tiresomely 是形容词 tiresome 的副词形式，由 tire（使疲倦）加后缀 -some（表示"产生...的"）构成形容词，再加上 -ly 变成副词。tiresome 意思是"令人厌倦的"，tiresomely 则表示"令人厌烦地"。