This is the 2178th most frequent Polish word.
prawdopodobne
"Likely" or "probable."
The word 'prawdopodobne' is used as an adjective describing a likelihood related to an event happening.
Jest prawdopodobne, że jutro będzie padać.
It is likely that it will rain tomorrow.
Here, 'prawdopodobne' serves as an adjective qualifying 'powody' (reasons).
Prawdopodobne powody jego decyzji są nam nieznane.
The likely reasons for his decision are unknown to us.
In this instance, 'prawdopodobne' is used to express a possibility in the context of a question.