wrong·head·ed 
/ˈrɑ:ŋˈhɛdəd/ adjective
/ˈrɑ:ŋˈhɛdəd/ adjective [more wrongheaded; most wrongheaded] : having or showing opinions or ideas that are wrong
▪ wrongheaded people ▪ a wrongheaded approach to dealing with the problem
▪ wrongheaded people ▪ a wrongheaded approach to dealing with the problem
