overcredulous

adjective

over·​cred·​u·​lous ˌō-vər-ˈkre-jə-ləs 

: credulous to an excessive degree : overly inclined to believe something especially on slight or uncertain evidence

Because believing in a fake hazard is less harmful than failing to believe in a real one, evolutionarily speaking, we should err on the side of being overcredulous about threats.

—Matthew Hutson

Word History

First Known Use

1579, in the meaning defined above