credulous
🇺🇸
/ˈkredʒələs/
🇬🇧
/ˈkredʒələs/
A person who easily believes things without proof.
The con artist found it easy to deceive his credulous victims.
詐欺師は彼の信じやすい犠牲者をだますのが簡単だとわかった。