accident An unfortunate incident that happens unexpectedly and unintentionally, typically resulting in damage or injury. (https://en.oxforddictionaries.com/definition/accident)
Example:
Two people were killed in a car accident
Czech translation: nehoda
French translation: accident
German translation: Unfall
Italian translation: incidente
Persian translation: تصادف
Polish translation: wypadek
Russian translation: авария
Spanish translation: accidente
Swedish translation: olycka