Synonyms of 'skin-deep'
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the external surface of the wall
If you describe a person, piece of work, or idea as shallow, you disapprove of them because they do not show or involve any serious or careful thought.
I think he is shallow, vain and untrustworthy.
Superficial is used to describe the appearance of something or the impression that it gives, especially if its real nature is very different.
It may well look different but the changes are only superficial.
Thesaurus for skin-deep from the Collins English Thesaurus
Something that is only skin deep is not a major or important feature of something, although it may appear to be.