If diplomacy is about communication, how does ghosting communicate? China has increasingly used ghosting or silent treatment when practising diplomacy. It has purposefully cut off high-level communication channels with its ‘significant others’ in recent years. When and why does China ghost other states, including its most important partners? How does strategic ghosting fit with the more combative turn in China's ‘wolf warrior diplomacy’ under Xi Jinping? Current scholarship on emotional diplomacy largely focuses on the display of emotions but rarely deals with diplomacy in which the expressions of emotions are covert. This article argues that ghosting diplomacy usually follows a perceived severe violation of core interests; rather than directly displaying emotions like anger, silent treatment is a covert aggression that is punitive by nature. Building on works of emotional diplomacy, security studies and social psychology, this article contributes to the conceptualization and theorization of interstate silent treatment in International Relations and unravels the motives of states to resort to this strategy. Through discourse analysis in a single case-study on China's silent treatment of the United States in the aftermath of former House speaker Nancy Pelosi's visit to Taiwan in 2022 and the 2023 incident involving suspected surveillance balloons, the research provides a thick description and explanation of how China's ghosting diplomacy unfolded amid heightened geopolitical tensions between the two great powers. As such, it is relevant for both scholars and policy-makers working in foreign policy, in that it sheds light on this covert aggressive form of diplomacy, and on how states can best respond to it.