Temperamental
Meaning:
Temperamental describes a person or thing characterized by unpredictable or volatile behavior, often influenced by mood changes. Individuals labeled as temperamental may exhibit frequent shifts in emotions, temperament, or attitudes, making their responses to situations difficult to predict. Such variability can stem from internal factors like emotional states or external stimuli. A temperamental artist, for example, might experience intense creative highs and lows. In mechanical contexts, a temperamental device may function erratically. The term captures the idea of sensitivity to environmental or emotional factors, leading to fluctuations in behavior or performance that can be challenging for others to anticipate or manage.