Tiny is a synonym of Slight. Slight is the opposite of Thick. 
Reaction is related to Feel. Feel is related to Sense. Sense is related to Logic. Logic is a type of Principle. 
Tiny <--Synonym--> Slight <--Antonym--> Thick 
Reaction <--RelatedTo--> Feel <--RelatedTo--> Sense <--RelatedTo--> Logic --IsA--> Principle 