Lonesome is a feeling of being isolated or withdrawn from society. When you feel lonesomely, you are experiencing this feeling in an adverb form. There are several synonyms for this word, including solitarily, desolately, alone, isolated, and lonely. Solitarily refers to being alone and without companions, while desolately suggests a feeling of emptiness and disconnection from the world around you. Alone is a more general term for being by yourself, whereas isolated implies a separation from others. Lastly, lonely refers to the sadness and discomfort of being alone, often due to a lack of social connections. All of these synonyms capture a similar sentiment of feeling detached and alone in the world.