a calamitous event, especially one occurring suddenly and causing great loss of life, damage, or hardship, as a flood, airplane crash, or business failure.
Natural disasters
Annotations:
Natural disasters are events caused by natural phenomena, such as earthquakes, floods, tsunamis or landslides, which generate large human, environmental and/or material losses. According to the United Nations, 70% of natural disasters today are climate related, twice as many as two decades ago.
https://www.activesustainability.com/environment/learnsustainability-natural-disasters/
Disaster, calamity, catastrophe, cataclysm refer to adverse happenings often occurring suddenly and unexpectedly.
A disaster may be caused by carelessness, negligence, bad judgment, or the like, or by natural forces, as a hurricane or flood: a railroad disaster.
Calamity suggests great affliction, either personal or general; the emphasis is on the grief or sorrow caused: the calamity of losing a child.
Catastrophe refers especially to the tragic outcome of a personal or public situation; the emphasis is on the destruction or irreplaceable loss: the catastrophe of a defeat in battle.
Cataclysm, physically an earth-shaking change, refers to a personal or public upheaval of unparalleled violence: a cataclysm that turned his life in a new direction.
Something that is annoying or a failure, but not very bad
Annotations:
I made a series of disasters in the kitchen
My birthday party was a complete disaster