Loneliness can be experienced in different ways. By visualizing the dimensions of loneliness, healthcare professionals have a deeper understanding of what the concept of loneliness is. The purpose of this study was to analyze the meaning of the word loneliness through a concept analysis. The method used in this study was a concept analysis according to Peep Koort´s semantic method. Loneliness was defined according to etymological dictionaries as in the relationship to be lonely, for example,”A frozen trail that disappears in the loneliness of the forest”. In the definition of loneliness the analysis of the dictionaries resulted in several synonyms, three of which were chosen for further analysis. The most prominent synonyms was ”ödslighet” (desolation),” enslighet” (solitude) and ”isolering” (isolation). The theoretical definition of the outcome was discussed in a philosophical and health science perspective. The result showed both positive and negative aspects of loneliness. Loneliness can be a time of silence and reflection, but can also mean human suffering. From a scientific perspective, it is important to pay attention to the experiences of loneliness in patients and relatives in order to be able to provide appropiate support as a heathcare professional. In summary, loneliness can be illustrated by the metaphor ” The loneliness that exists in the deepest forest”.