causeless

/ˈkɔzləs/
adjective
  1. Having no known cause or reason; happening without explanation.
    • Historians debated whether the war was truly causeless or if there were hidden factors.
    • She felt a causeless sadness that she couldn't explain to her friends.
    • The sudden, causeless storm surprised everyone on the beach.
What does "causeless" mean? | whatsthatwordmean | whatsthatwordmean