1. too willing to believe things; excessively trusting or gullible
Usage: formal

Examples

• The overcredulous investor lost money to several obvious scams.
• She was overcredulous about online reviews and bought products that didn’t work.
• His overcredulous nature made him an easy target for con artists.
• The overcredulous audience believed every claim made by the fake psychic.
• Parents warned their overcredulous daughter about strangers offering help.
• The overcredulous jury accepted the defendant’s implausible alibi.