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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.
adjective. (Of a person or their manner) childishly sulky or bad-tempered: he was moody and petulant a petulant shake of the head. More example sentences. 1  By midnight, he was pouting like a petulant kid being kept after school. 2  I cycled off, leaving him to glower after me like a petulant teenager.ate 16th century (in the sense 'immodest'): from French petulant, pÃ©tulant From latin- 'petulant' (impudent related to 'petere aim, at'). Seek the current (sense mid 18th) century is influenced by. pettish