misfortune

As a proper noun death

is the personification of death, often a skeleton with a scythe, and one of the four horsemen of the apocalypse.

As a noun misfortune is

(uncountable) bad luck.

As nouns the difference between misfortune and serendipity

is that misfortune is (uncountable) bad luck while serendipity is an unsought, unintended, and/or unexpected, but fortunate, discovery and/or learning experience that happens by accident.

As nouns the difference between misfortune and loss

is that misfortune is (uncountable) bad luck while loss is (lus).

As nouns the difference between misfortune and setback

is that misfortune is (uncountable) bad luck while setback is an obstacle, delay, or disadvantage.

As a noun misfortune

is (uncountable) bad luck.

As an adjective undefined is

lacking a definition or value.

Mischief is a related term of misfortune.

As nouns the difference between mischief and misfortune

is that mischief is harm or evil caused by an agent or brought about by a particular cause while misfortune is (uncountable) bad luck.

Misfortune is a related term of downfall.

As nouns the difference between misfortune and downfall

is that misfortune is (uncountable) bad luck while downfall is a precipitous decline in fortune; death or rapid deterioration, as in status or wealth.

As a verb downfall is

to fall down; deteriorate; decline.