Definition of cretinism in US English:

cretinism

noun

  • 1offensive, informal Foolishness or stupidity.

  • 2Medicine
    dated A condition characterized by physical deformity and learning disabilities that is caused by congenital thyroid deficiency.

Origin

Early 19th century: from cretin + -ism.

Pronunciation

cretinism

/ˈkritnˌɪzəm//ˈkrētnˌizəm/