Mercurial managers are leaders whose behavior, decisions, and moods shift rapidly and unpredictably, creating instability, high stress, and reduced trust within teams.
 
Characterized by emotional volatility and inconsistency, they often flip-flop on decisions, leading to organizational whiplash.
 
These managers can appear charismatic one moment and hostile or insecure the next, often causing employees to feel anxious or disengaged.