pseudosopher
/s(j)uːˈdɒsəfə/rare
noun
A sham or spurious philosopher; a person who falsely believes himself or herself to be wise.
Origin
Mid 19th century; earliest use found in Punch. From pseudo- + -sopher. Compare Hellenistic Greek ψευδόσοϕος falsely wise, post-classical Latin pseudosophus.