Genuine is the opposite of Plastic. Plastic can Melt. 
Thin is a different concept from Thick. Thick is similar to Intense. Intense is similar to Profound. 
Genuine <--Antonym--> Plastic --CapableOf--> Melt 
Thin <--DistinctFrom--> Thick <--SimilarTo--> Intense <--SimilarTo--> Profound 