kostuvuuden

I want to make sure I write an accurate article, but kostuvuuden is not a clearly defined term in English-language references. It appears to be Finnish and could have a few possible meanings. Could you confirm which meaning you intend, or provide a source or definition? Here are two plausible interpretations I could base a concise wiki-style article on, if you’d like:

- Kostavuus (revengefulness): a philosophical or psychological concept describing the quality or tendency of a person or culture to seek revenge, including its etymology from kosto (revenge) and its usage in literature or ethics.

- A specific Finnish term or proper noun: if kostuvuuden refers to a particular concept, movement, theory, or organization in Finnish discourse, please specify so I can tailor the article.

Once you confirm the intended meaning, I’ll produce a neutral, concise wiki-style article under 300 words.