Politician can be Old. Politician is related to Man. Man is a type of Lover. 
Glad is the opposite of Sad. Sad is related to Depression. Depression is related to Bad. Bad is a different concept from Perfect. 
Old <--HasProperty-- Politician <--RelatedTo--> Man --IsA--> Lover 
Glad <--Antonym--> Sad <--RelatedTo--> Depression <--RelatedTo--> Bad <--DistinctFrom--> Perfect 