Idiotism
Idiotism , noun
[French idiotisme, Latin idiotismus the way of fashion of a private person, the common or vulgar manner of speaking, Greek {not transcribed}, from {not transcribed} to put into or use common language, from {not transcribed}. See Idiot.]
1.
An idiom; a form, mode of expression, or signification, peculiar to a language.
Scholars sometimes give terminations and idiotisms, suitable to their native language, unto words newly invented.
2.
Lack of knowledge or mental capacity; idiocy; foolishness.
Worse than mere ignorance or idiotism.
The running that adventure is the greatist idiotism.