The term "Lonely" refers to a state or feeling of being alone, isolated, disconnected and unhappy due to lack of companionship. It can also refer to a person who is without friends, family, or other social connections, leading them to feel sad, unfulfilled, or cut off from others. Loneliness can be caused by various factors such as physical distance, loss of loved ones, social anxiety, depression, or lack of opportunities for meaningful interactions with others. It is a subjective experience and people may feel lonely even when they are physically surrounded by other people.