The Vietnamese word "buồn tình" can be understood as feeling bored or lonely, particularly when you are alone and not engaged in any activity. It often describes a sense of restlessness or a desire to do something enjoyable when you find yourself with nothing to do.
In summary, "buồn tình" is a useful phrase to express feelings of boredom or loneliness, especially when alone. It can reflect a desire for companionship or activity to alleviate those feelings.