"Lonely" refers to a feeling of sadness or isolation that occurs when a person feels disconnected from others. This emotion can arise even in the presence of people, highlighting the difference between being alone and feeling lonely. It often leads to a sense of longing for companionship or meaningful relationships. Loneliness can affect anyone, regardless of age or social status, and is linked to various mental health issues, such as depression and anxiety. It can also impact physical health, leading to problems like heart disease and a weakened immune system. Addressing loneliness often involves fostering social connections and seeking support.