THESAURUS
skin deep
ankle-deep, cortical, cursory, cutaneous, depthless, dermal, dermic, ecderonic, ectodermal, ectodermic, endermatic, endermic, epicarpal, epidermal, epidermic, few, footling, furry, hypodermal, hypodermic, inconsequential, inconsiderable, insignificant, jejune, knee-deep, light, little, low, meager, miniature, negligible, no great shakes, not deep, on the surface, petty, picayune, picayunish, shallow, shallow-rooted, shoal, short, skinny, slight, small, subcutaneous, superficial, surface, testaceous, thin, tiny, trifling, trivial, unprofound
ROGET THESAURUS
skin deep
Shallowness
N
shallowness, shoals, mere scratch, shallow, slight, superficial,
skin deep, ankle deep, knee deep, just enough to wet one's feet, shoal, shoaly.