MEANING:
Noun: Accident, crash, disaster, wretchedness, misfortune, etc. (For more meanings check sanakirja.org.)
DERIVED FROM:
Onnettomuus is a noun derived from the adjective onneton (”unhappy”) + the suffix –(u)us (front vowel harmony variant –(y)ys) which is used to create nouns from adjectives. Onneton in turn comes from the noun onni (”happiness”) plus the –ton suffix used to create an adjective indicating a lack of happiness. So you might say onnettomuus is a noun that comes from an adjective that was created from noun
EXTRA CREDIT:
Here are some compound words you often see with onnettomuus.
- Auto-onnettomuus – auto accident. (You also hear kolari, as we featured some days ago.)
- ydinvoimalaonnettomuus – nuclear power station accident (or just ydinonnettomuus)
- Junaonnettomuus – train accident
- Kaivosonnettomuus – mining accident
- Lento-onnettomuus – aircraft accident
- Öljyonnettomuus – oil accident