unknown cause

Examples (10)

• The fire destroyed the building, but its origin remains an unknown cause.
• Doctors are trying to determine why he fell ill; for now, it's a disease of unknown cause.
• The official report concluded that the plane crashed due to an unknown cause.
• She died of a rare condition with a completely unknown cause.
• Many historical extinctions are still attributed to an unknown cause.
• The system shutdown was triggered by an unknown cause, and engineers are still investigating.
• His sudden disappearance is a mystery, currently logged as stemming from an unknown cause.
• For a long time, the strange phenomenon was a scientific puzzle of unknown cause.
• The sudden surge in the stock market had an unknown cause, baffling analysts.
• If a patient's symptoms persist due to an unknown cause, further tests are required.