Causing or resulting in terrible damage, disaster, or misfortune; extremely unfortunate or disastrous.
From Latin 'calamitas' (disaster, damage to crops) + '-ous' (full of). The Latin root's origin is uncertain but may relate to crop failure or military defeat.
The word 'calamity' originally meant crop failure in Latin, which makes perfect sense—to ancient farmers, a destroyed harvest was the ultimate disaster, worse than any battle.
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