The correct antonym for EUPHORIA is Melancholy.
Euphoria is defined as a feeling or state of intense excitement and happiness. It is a powerful sense of well-being, often disproportionate to the actual circumstances, characterized by elation, joy, and an overwhelming sense of pleasure. This state is typically temporary and can be experienced in response to significant achievements, certain stimuli, or even as a symptom of some medical conditions. It represents the peak of positive emotional experience.
Conversely, Melancholy refers to a feeling of pensive sadness, typically with no obvious cause. It is a deep, often prolonged state of gloominess, despondency, or wistful sorrow. Unlike acute sadness, melancholy often carries a contemplative or reflective quality, a quiet despair rather than an outburst of grief. This profound sense of sadness and low spirits directly opposes the intense joy and excitement of euphoria. While 'Happiness,' 'Excitement,' and 'Thrill' are all related to or aspects of euphoria, 'Melancholy' is its most fitting antonym, representing a profound negative emotional state.