truster

/ˈtrʌstər/
noun
  1. A person who trusts someone or something; someone who has confidence in another's honesty or reliability.
    • The investor was a cautious truster, only putting money into companies with a long track record.
    • As a natural truster, she always believed her friends would keep their promises.
    • Being a truster in a dishonest world sometimes led to disappointment.
Antonyms
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