不幸 (fukō) means “bad luck” | MotiTan Japanese Dictionary

More examples

思いがけない不幸に見舞われました。omo i ga ke na i fu kō ni mi ma wa re ma shi ta

I suffered an unexpected misfortune.

Covers both an unlucky event that affects someone and a state in which happiness is absent.

不運fuun: A state in which bad luck causes things to go wrong.
災難sainan: An unexpected event that brings serious trouble or harm.

身に起こる不運や、幸福でない状態。mi ni o ko ru fu un ya kō fuku de na i jō tai

The Sino-Japanese compound 不幸 (fukō) combines 不 (fu, "not") and 幸 (kō, "happiness"), linking the word with a lack of happiness.

In everyday conversation, 不幸 (fukō) often refers to a run of unfortunate events, while 不幸な (fukō na) can describe a person or situation that is unhappy or unfortunate.