Contemptuous (adjective)

1. Feeling or showing disdain or disrespect for someone or something.
2. Feeling or showing contempt.

Origin:

Early 17th century: from latin contemptus, past participle of contemnere "despise", from con- "with" + temnere "to despise".

Examples:

1. He had a contemptuous expression on his face.
2. She was contemptuous of his attempts to apologize.
3. The manager's contemptuous attitude made it hard for employees to work.
4. His contemptuous behavior was not acceptable in the workplace.
5. The speaker's contemptuous tone made it clear that she had no interest in the topic.