1.
natural disaster; natural calamity
A disaster caused by natural forces such as earthquakes, typhoons, floods, or droughts, as opposed to one caused by human action.
Related Words
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人災 (man-made disaster)
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災害 (disaster)
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異常気象 (abnormal weather)
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災厄 (calamity)
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厄災 (calamity)
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自然災害 (natural disaster)