superficially
adv.in a way that only looks true or is only on the surface. You use this when something seems one way, but it is actually different underneath.
adv.in a manner that affects only the surface or is based on a lack of depth. Often used to describe appearances that do not reflect the underlying reality.
“The two companies look similar, but they are superficially different.”
“The two brothers appeared superficially identical, but their personalities were completely different.”
“While the two political movements share a common goal, their underlying philosophies are superficially similar but fundamentally incompatible.”
“This would allow the company to superficially inflate its plan costs and skirt medical loss ratio rules to increase its profits.”
From superficial + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.