The word “facetious” is an adjective that describes someone or something as treating serious issues with inappropriate humor or sarcasm. It is often used to indicate a lighthearted or joking tone, but can also imply a lack of seriousness or sincerity.

Interesting fact: The word “facetious” is derived from the Latin word “facetia,” which means “jest” or “witty saying.” It entered the English language in the 16th century and has since become a commonly used term to describe humorous or sarcastic remarks.