pseudo-concept
/ˌs(j)uːdəʊˈkɒnsɛpt/noun
A false or spurious concept; (Philosophy ) a notion which is sometimes treated as a concept though it cannot be properly conceptualized or grasped by the mind.
Origin
Mid 19th century; earliest use found in Henry Longueville Mansel (1820–1871), dean of St Paul's and theologian. From pseudo- + concept.