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Synonyms for Lonesome (same or very similar meaning)

WordNet sense 1 (being the only one; single and isolated from others):
lone, only, sole, solitary

WordNet sense 2 (existing alone or consisting of one entity or part or aspect or individual):
single

WordNet sense 3 (marked by dejection from being alone):
lonely

WordNet sense 4 (affected or marked by low spirits):
dejected


From the ODE community, based on WordNetadd/edit