Diabetes is a type of Disease. Ad is derived from Disease. 
Interested is a synonym of Concerned. Concerned is similar to Afraid. Afraid is the opposite of Brave. Brave is the opposite of Mean. 
Diabetes --IsA--> Disease <--DerivedFrom-- Ad 
Interested <--Synonym--> Concerned <--SimilarTo--> Afraid <--Antonym--> Brave <--Antonym--> Mean 