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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.
Definition of mood. 1  1 : the form of a syllogism as determined by the quantity and quality of its constituent propositions. 2  2 : distinction of form or a particular set of inflectional forms of a verb to express whether the action or state it denotes is conceived as fact or in some other manner (as command, possibility, or wish) 3  3 : mode 1b.