ettearvamatu

Ettearvamatu is an Estonian adjective meaning "unpredictable" or "not able to be foreseen." The word is derived from the verb phrase ette arvama ("to predict" or "to foresee") combined with the adjectival element that conveys inability, producing a term used to describe events, behaviour, or phenomena that resist reliable anticipation.

Grammatically, ettearvamatu functions as a regular Estonian adjective and can be inflected for case and number to agree with nouns in attributive or predicative positions. It appears frequently in everyday language and media to characterize weather, human actions, markets, artistic choices, and other contexts where outcomes are uncertain.

Common synonyms include ennustamatu, while antonyms include ennustatav and ettearvatav (predictable). Typical usage examples in Estonian are "Ilm on ettearvamatu" (The weather is unpredictable) and "Tema otsused on ettearvamatud" (Her decisions are unpredictable).

In cultural and literary contexts, ettearvamatu is used to evoke tension, surprise, or the limits of human knowledge and control. It is also used in technical and scientific discourse to discuss stochastic processes, chaotic systems, or insufficiently modeled phenomena where predictability is limited.