The adjective superficial means someone who doesn’t think deeply, and has little understanding of anything serious or important.
Synonyms are empty, depthless, shallow, or sketchy.
The word origins from Late Latin (late 14th century) superficialis meaning “of or pertaining to the surface” which is from superficies meaning “surface, upper side, top”. It comes from super plus facies meaning “not deep, without thorough understanding, cursory, comprehending only what is apparent or obvious”.
That stranger is a superficial yuppie with no intellect whatsoever.
The story of her book is consistently negative, occasionally arrogant, and often superficial.
Those people are superficial when it comes to obeying the law.