Usages of haastava
Ajattelen, että suomi on joskus haastava, mutta juuri siksi se on kiinnostava.
I think that Finnish is sometimes challenging, but for that very reason it is interesting.
Tämä tehtävä on haastava, mutta opin paljon.
This task is challenging, but I learn a lot.
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We have an entire course teaching Finnish grammar and vocabulary.