Solecism (noun)

1. A mistake in grammar, syntax, or vocabulary in speaking or writing.
2. An incorrect or nonstandard usage in speech or writing.
3. An instance of bad manners or etiquette.

Origin:

The word "solecism" comes from the latin word "solecismus" which is derived from greek "solekismos" meaning "a wrong action or speech" and "solekizein" meaning "to speak incorrectly.".

Examples:

1. The solecism in her sentence made it difficult to understand her meaning.
2. His solecism in grammar made his presentation hard to follow.
3. The solecism in her speech was a distraction from her message.
4. His solecism in punctuation made his written work hard to read.
5. The solecism in his manners made him an unwelcome guest.