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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.
GCIDE(0.00 / 0 votes)Rate this definition: Labile(a.) Liable or likely to change. Labile(a.) (Chem.) Easily decomposed or inactivated when subjected to heat, radiation, or mildly acidic or alkaline conditions; -- of chemical compounds; as, enzymes from thermophilic organisms are not as labile as those from mesophiles.