"Melancholia" refers to a profound and persistent sadness or depression, often described as a state of deep emotional distress. In the context of the film directed by Lars von Trier, the term reflects the characters' struggles with their mental health and the impending doom of a planet colliding with Earth. The film explores themes of existential despair, relationships, and the contrast between different emotional responses to catastrophic events, particularly focusing on the dichotomy between the two sisters, Justine and Claire.

Melancholia is an ancient term that historically refers to a state of profound sadness or depression. In medical terms, it was once associated with a specific type of major depressive disorder characterized by severe despondency, lack of interest in life, and emotional numbness. The term originates from the Greek word "melancholia," meaning "black bile," reflecting ancient beliefs that an imbalance of bodily fluids could affect mood. In the context of the film "Melancholia," it symbolizes the inner turmoil and existential dread faced by the characters against the backdrop of an impending planetary disaster.

In the movie "Melancholia," directed by Lars von Trier, the mental illness portrayed is major depressive disorder, often referred to as melancholia. The film explores the profound emotional and psychological struggles of the main character, Justine, who experiences deep despair, hopelessness, and a sense of detachment. Her depression is contrasted with her sister Claire's anxiety about an impending apocalypse, highlighting different responses to overwhelming circumstances. The film poignantly illustrates the complexities of mental illness and its impact on relationships.

In Lars von Trier's "Melancholia," the term refers to both the psychological condition of depression and the impending collision of a rogue planet, Melancholia, with Earth. The film explores how the characters cope with existential dread and personal despair in the face of inevitable doom. The melancholic state of the protagonist, Justine, reflects a deeper commentary on mental illness and the human condition, illustrating how different individuals respond to crisis and the weight of impending catastrophe.