Academic is related to Class. Class is related to Bell. 
Cruel is related to Nasty. Nasty is a synonym of Tight. Tight is similar to Secure. Secure is similar to Steady. 
Academic <--RelatedTo--> Class <--RelatedTo--> Bell 
Cruel <--RelatedTo--> Nasty <--Synonym--> Tight <--SimilarTo--> Secure <--SimilarTo--> Steady 