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Quick Answer. In a psychological context, labile mood refers to a mood state in which a person experiences wild, uncontrolled mood swings. Labile mood is also known as labile affect, emotional dysregulation and pseudobulbar affect.
As the reduction in display of emotion becomes more severe, the term blunted affect may be applied. The absence of any exhibition of emotions is described as flat affect where the voice is monotone, the face expressionless, and the body immobile. Labile affect describes emotional instability or dramatic mood swings.