What does cordially sinister air mean?

"Cordially sinister air" is an oxymoron that combines two opposite adjectives, "cordial" and "sinister". "Cordial" means friendly, warm, and welcoming, while "sinister" means evil, threatening, or harmful. The phrase is used to describe a situation or atmosphere that is seemingly friendly and inviting but also has an underlying sense of danger or malice. It is often used to describe people or places that appear harmless but are actually malevolent or have hidden motives.