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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.
Full Definition of PETULANT. 1. : insolent or rude in speech or behavior. 2. : characterized by temporary or capricious ill humor: peevish.â petÂ·uÂ·lantÂ·ly adverb.See petulant defined for English-language learners. Oxford's denial of her [Margaret Thatcher's] honorary degree in 1984 was no petulant fluke but an accurate measure of her unpopularity with the whole profession. â 2 Harold Perkin, Times Literary Supplement, 26 June 1992.