Which word describes a dry and ironic form of humor?

The word that best describes a dry and ironic form of humor is "wry." This term specifically refers to a type of humor that is often subtle and involves a certain level of irony or sardonic wit. Wry humor tends to be understated and may rely on an incongruity between the expectations created by the situation and the truth that is revealed, thus producing a dry comedic effect.

In contrast, while "sarcastic" also involves irony and a mocking tone, it is generally more direct and confrontational than wry humor. "Facetious," on the other hand, involves treating serious issues with deliberately inappropriate humor. While it can be humorous, it lacks the nuanced irony that characterizes wry humor. "Humorous" is a broad term that encapsulates various types of humor but does not specifically imply the dry and ironic qualities that define wry humor.