Definition of platitudinism in English:
platitudinism
noun ˌplatɪˈtʃuːdnɪz(ə)mˌplatɪˈtjuːdnɪz(ə)m
Banality in speech or writing; = platitudinarianism.
Origin
Mid 19th century; earliest use found in The Atlantic Monthly. From platitude + -in- + -ism, after e.g. latitudinism.