This is the 845th most frequent Dutch word.
moeilijker
"More difficult"
In this sentence, 'moeilijker' is used as a comparative adjective to express increasing difficulty over time.
Deze taak wordt moeilijker naarmate je verder komt.
This task becomes more difficult as you progress.
Here, 'moeilijker' compares the difficulty of two subjects, indicating that mathematics is perceived as harder than history.
Ik vind wiskunde moeilijker dan geschiedenis.
I find mathematics more difficult than history.
In this sentence, 'moeilijker' is part of a correlation expressing that an increase in difficulty corresponds to an increase in interest.