unprecedented
/ʌnˈpɹɛsɪdɛntɪd/ adjective C1- Never before seen, done, or experienced; without precedent.
From the library
Everyone knows the history of the famous return from Elba, a return which was unprecedented in the past, and will probably remain without a counterpart in the future.
In 2018, the beautiful city of Cape Town faced an unprecedented environmental crisis.
The enthusiastic crowd erupted in joyous celebration, acknowledging that an unprecedented milestone in human achievement had finally been reached.
During the 1930s, an unprecedented ecological disaster transformed the southern Great Plains of the United States into a barren wasteland.
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