Several measures that assess loneliness have been developed for adults. Across three studies, we investigated psychometric features of different versions of the Rasch-Type Loneliness Scale, the UCLA Loneliness Scale, and three single-item measures. In Study 1 (N = 697 self-ratings, N = 282 informant-ratings of 163 targets) and Study 2 (N = 1,216 individuals from 608 couples), we investigated the convergent validity and self-informant agreement of the included measures. Furthermore, we compared the nomological nets of these measures using correlates related to demographic aspects, personality, satisfaction, and network characteristics. In Study 3 (N = 411), we estimated a reliability of $r_{xx} > .70$ for three single-item measures of loneliness in a short-term prospective study. Overall, all measures and their nomological nets were highly correlated within and across studies, indicating that the included measures are all reliable and valid. Recommendations for choosing a loneliness measure are discussed.
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