The book consists of seven chapters that systematically explore various dimensions of adult singlehood while addressing methodological considerations relevant to studies in this area. It encompasses topics such as the well-being of single adults, their life course trajectories, the challenges associated with aging, the phenomenon of inceldom, and the implementation of qualitative research that investigates the subjective experiences of single individuals. Furthermore, it presents the development and validation of a novel instrument designed to evaluate religious attributions related to singlehood. Overall, the book offers valuable new insights into the complexities of contemporary singlehood.