What is the term used when an audience displays a blank or uninterested expression?

The term that accurately describes an audience displaying a blank or uninterested expression is audience apathy. This phenomenon refers to a lack of interest, enthusiasm, or concern from the audience towards the presented material. When audience members exhibit apathy, they may seem disengaged and unresponsive, indicating that the message is not resonating with them or that they are not invested in the communication process. Recognizing audience apathy is crucial for a speaker, as it can signal the need to adjust their approach or engage the audience more effectively.

Other options might relate to aspects of audience engagement but do not specifically capture the essence of a blank or uninterested expression as clearly. For instance, listener-fatigue generally refers to exhaustion from prolonged listening, while communication breakdown pertains to a failure in effectively conveying the message, rather than the audience's emotional response. Listener-stupor could imply a lack of comprehension or awareness but doesn't specifically denote the blankness or disinterest highlighted in the question.