Life is related to Human. Human is related to Kind. Kind is related to Helpful. Helpful is a synonym of Favorable. 
Safe is the opposite of Trouble. Trouble is a synonym of Anxiety. Anxiety is related to Nervous. 
Life <--RelatedTo--> Human <--RelatedTo--> Kind <--RelatedTo--> Helpful <--Synonym--> Favorable 
Safe <--Antonym--> Trouble <--Synonym--> Anxiety <--RelatedTo--> Nervous 