Eitakuullinen
Eitakuullinen is a Finnish term that translates to "unheard of" or "unprecedented" in English. It describes something that has never been experienced, known, or done before. The word is formed by combining "ei" (not), "takuulla" (certainly, guaranteed), and "llinen" (a suffix indicating possession or characteristic). Thus, literally, it suggests something that is not even guaranteed to have happened or existed.
The concept of eitakuullinen is often used to emphasize the novelty or uniqueness of a situation, discovery,
In everyday language, eitakuullinen can also be used more casually to express astonishment at something unexpected