Stupidity

Stupidity was a lack of intelligence. Those who demonstrated stupidity were referred to as being stupid. The Eleventh Doctor claimed that alien technology plus human stupidity was "unbeatable". (TV: The Day of the Doctor)

Jack Harkness called Rhys Williams stupid for his belief that the appearances of the Sycorax spaceship and the Cybermen during the Battle of Canary Wharf were mass hallucinations caused by terrorists contaminating water supplies with drugs. (TV: Everything Changes)