mercurialness

/mərˈkjʊriəlnəs/
noun
  1. The quality of being quick to change in mood, behavior, or opinion; unpredictability.
    • Artists are sometimes admired for their mercurialness, but it can be exhausting for those close to them.
    • The coach's mercurialness kept the team on edge during practice.
    • Her mercurialness made it hard for friends to know how she would react.
Antonyms
What does "mercurialness" mean? | whatsthatwordmean | whatsthatwordmean