skin-deep

[skin-deep] /ˈskɪnˈdip/
adjective
1.
superficial or slight; not profound or substantial:
Their sincerity is only skin-deep.
adverb
2.
slightly; superficially:
He went into the subject only skin-deep.
Origin
1605-15
British Dictionary definitions for skin deep

skin-deep

adjective
1.
superficial; shallow
adverb
2.
superficially
Idioms and Phrases with skin deep

skin deep