1. The quality or state of experiencing frequent, unpredictable changes in emotional state or temperament
His variability of mood made it difficult for colleagues to predict his reactions.
A variabilidade de humor dele tornava difícil para os colegas prever suas reações.
2. In psychology/medicine: fluctuations in emotional states that may indicate mood disorders or emotional instability
The patient's variability of mood was documented as a symptom of bipolar disorder.
A variabilidade de humor do paciente foi documentada como um sintoma do transtorno bipolar.