A solecism can also imply cultural insensitivity or ignorance when speaking a foreign language. Using the informal 'tu' instead of 'vous' in French to a stranger may be seen as a solecism.
Pro Tip 2/3
Formal Writing
Avoiding solecisms is especially important in formal writing to maintain credibility. Submitting an essay with solecisms can reduce your grade.
Pro Tip 3/3
Language Nuances
Understanding local idioms and expressions can help avoid solecisms. Saying 'I lost my heads' instead of 'I lost my head' is a solecism.