Sensitive is a synonym of Sweet. Sweet is the opposite of Bitter. Bitter is related to Dark. 
Intellectual is similar to Serious. Serious is related to Important. Important is similar to Outstanding. Outstanding is a synonym of Striking. 
Sensitive <--Synonym--> Sweet <--Antonym--> Bitter <--RelatedTo--> Dark 
Intellectual <--SimilarTo--> Serious <--RelatedTo--> Important <--SimilarTo--> Outstanding <--Synonym--> Striking 