Ridiculous is a synonym of Dumb. Dumb is related to Stupid. Stupid is related to Fool. 
Weakness is a synonym of Disability. Disability is the opposite of Potential. Prospect is a type of Potential. 
Ridiculous <--Synonym--> Dumb <--RelatedTo--> Stupid <--RelatedTo--> Fool 
Weakness <--Synonym--> Disability <--Antonym--> Potential <--IsA-- Prospect 