Hint is related to Indication. Glimpse is a type of Indication. Glimpse is related to See. See is a synonym of Ensure. 
River is related to Denial. Denial is related to Psychological. Psychological is related to Depression. Depression is the opposite of Happiness. 
Hint <--RelatedTo--> Indication <--IsA-- Glimpse <--RelatedTo--> See <--Synonym--> Ensure 
River <--RelatedTo--> Denial <--RelatedTo--> Psychological <--RelatedTo--> Depression <--Antonym--> Happiness 