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The Unfortunate Traveller was created in 1594.
The Unfortunate Policeman was created in 1905.
The Unfortunate Rake was created in 1960.
Piero the Unfortunate was born in 1471.
Unfortunateness is the noun form of the adjective unfortunate, rather unwieldy compared to more common word misfortune.
Unfortunate itself is a noun when used to mean an unfortunate person.