This is the 717th most frequent Finnish word.
epäilee
"Doubts" or "suspects."
In this sentence, 'epäilee' means 'suspects' being used in the context of doubt or holding someone in suspicion.
Hän epäilee häntä valheesta.
He/she suspects them of lying.
Here, 'epäilee' conveys a sense of doubt or uncertainty regarding an event.
Hän epäilee, että huomenna sataa.
He/she doubts that it will rain tomorrow.
This indicates the teacher has reservations or doubts about the level of comprehension among the students.