solecism

 
Pronunciation: /ˈsɒlɪsɪz(ə)m/

noun

  • a grammatical mistake in speech or writing.
  • a breach of good manners; an instance of incorrect behaviour.

Derivatives

solecistic

Pronunciation: /-ˈsɪstɪk/
adjective

Origin:

mid 16th century: from French solécisme, or via Latin from Greek soloikismos, from soloikos 'speaking incorrectly'