This is the 464th most frequent Estonian word.
poleks
"Poleks" is the conditional form of "pole," meaning "would not be" or "would not have" in English.
Here, 'poleks' is again used in a conditional past form to express an unrealized scenario in the past.
Ma poleks kunagi arvanud, et see võimalik on.
I would never have thought that this is possible.
In this sentence, 'poleks' is used as a conditional past form of the verb 'to be' (olema), expressing something that did not happen but could have under different circumstances.
Kui ma teaksin, et sa tuled, siis ma poleks koju jäänud.
If I knew you were coming, I wouldn't have stayed home.
The word 'poleks' demonstrates its use in indicating a dependency for the past hypothetical scenario.