In this paper, I draw on Heidegger's phenomenology of "moods" ( Stimmungen ) to interpret loneliness as a diffused and atmospheric feeling-state that often undergirds the lives of older adults, shaping the ways in which they are attuned to and make sense of the world. I focus specifically on residents in long-term care facilities to show how the social isolation and lockdown measures of the COVID-19 pandemic dramatically intensified the mood. The aim is to shed light on how profound and totalizing the experience has been for residents. Making use of Heidegger's account of the affective "collapse" or "breakdown" ( Zusammenbruch ) of meaning, I argue that when older adults are functionally locked in their rooms for months at a time and cut off from the orienting routines and rhythms of the relational world, the result is a crumbling of the fundamental meaning-structures that constitute subjectivity. The global sense of abandonment and disconnection strips away the possibility for self-understanding, and residents are often left confused and abandoned to an existence that has been drained of meaning and significance.