Surprised is a form of Surprise. Surprise is related to Scared. 
Free is a synonym of Independent. Independent is the opposite of Dependent. Dependent is derived from Depend. Depend is a synonym of Trust. 
Surprised --FormOf--> Surprise <--RelatedTo--> Scared 
Free <--Synonym--> Independent <--Antonym--> Dependent --DerivedFrom--> Depend <--Synonym--> Trust 