Which word describes humor that is delivered dryly?

The term that best describes humor delivered in a dry manner is "wry." Wry humor is characterized by a subtle and often ironic form of amusement, where jokes or comments can carry a deeper meaning or a twist that reflects a dry wit. This type of humor often relies on a restrained delivery, where the comedic effect emerges from the contrast between the humor itself and the serious tone in which it is presented.

The other options do not pertain to the description of humor. "Arrogance" relates to having an exaggerated sense of one's own importance or abilities, while "apathy" denotes a lack of interest, enthusiasm, or concern. "Abstemious" is associated with moderation and self-restraint, particularly in consumption, and does not convey any notion of humor. Thus, "wry" is the most fitting word for humor delivered dryly.