Which word best describes humor that is dry and often sarcastic?

The word "wry" is the most fitting choice for humor that is dry and often carries a note of sarcasm. Wry humor typically involves a clever or ironic twist that is subtly communicated, often leaving the audience to appreciate the underlying sarcasm without overtly laughing out loud. This type of humor relies on a certain degree of sophistication and intelligence in its expression, making it distinct from other forms of comedy that may be more overt or light-hearted.

In contrast, the other options capture different aspects of humor but do not specifically convey the essence of dry sarcasm as effectively. "Witty" refers to humor that is quick and clever, but it doesn't necessarily imply dryness or sarcasm. "Facetious" involves treating serious issues with deliberately inappropriate humor, which can diverge from the subtlety associated with wry humor. "Amusing" is a general term that describes anything that causes laughter or enjoyment but lacks the specific qualities of dryness and sarcasm that are characteristic of wry humor. Thus, "wry" encapsulates the intended nuance of dry, sarcastic humor accurately.