Mad is related to Being. Being is related to Essence. 
Harsh is the opposite of Mild. Mild is related to Walking. Walking is related to Stair. Stair is related to Step. 
Mad <--RelatedTo--> Being <--RelatedTo--> Essence 
Harsh <--Antonym--> Mild <--RelatedTo--> Walking <--RelatedTo--> Stair <--RelatedTo--> Step 