The agreement was reached superficially, without addressing the core issues.

superficially 是形容词 superficial 的副词形式。superficial 由前缀 super-（表示"在...之上"）和词根 -ficial（来自拉丁语 facies，意为"表面"）组成，字面意思是"表面的"。superficially 表示"表面上地、肤浅地"，指没有深入实质内容。