capricious

/kəˈprɪʃəs/
adjective
  1. Likely to change suddenly and without reason; unpredictable.
    • Her capricious moods kept her friends guessing how she would react.
    • The capricious weather made it impossible to plan a picnic.
    • A capricious boss can make the workplace very stressful.
  2. Based on a sudden desire or whim rather than careful thought.
    • She made a capricious choice to dye her hair bright purple.
    • The king's capricious laws changed from week to week.
    • His capricious decision to quit his job surprised everyone.
What does "capricious" mean? | whatsthatwordmean | whatsthatwordmean