loneliness(condition of being lonely) noun [UK: ˈləʊn.lɪ.nəs] [US: ˈloʊn.li.nəs]There's nothing worse than loneliness. = Det finns inget värre än ensamhet.
solitariness(state or quality of being solitary) noun [UK: salə.ˈte.ri.nəs] [US: salə.ˈte.ri.nəs]
solitude [solitudes](state of being alone) noun [UK: ˈsɒ.lɪ.tjuːd] [US: ˈsɑː.lə.ˌtuːd]