The garbage in the kitchen smelled disagreeably.

disagreeably 是形容词 disagreeable 的副词形式。disagreeable 由前缀 dis-（表示"否定"）和 agreeable（"令人愉快的"）组成，意思是"令人不快的、讨厌的"。disagreeably 作为副词修饰动词 smelled，表示"以令人不快的方式散发气味"。