Motive is related to Cause. Cause is related to Trouble. 
Weak is a synonym of Shallow. Shallow is related to Water. Water is a type of Molecule. Hormone is a type of Molecule. 
Motive <--RelatedTo--> Cause <--RelatedTo--> Trouble 
Weak <--Synonym--> Shallow <--RelatedTo--> Water --IsA--> Molecule <--IsA-- Hormone 