This is the 14333rd most frequent Korean word.
못쓰게
"못쓰게" means "uselessly" or "in a spoiled/broken state."
In this sentence, '못쓰게' indicates a state of being unusable due to damage or malfunction.
그 기계는 고장나서 못쓰게 되었다.
The machine broke and became unusable.
Here, '못쓰게' describes an action resulting in the document becoming unusable.
너는 그렇게 중요한 문서를 못쓰게 만들었니?
Did you render such an important document unusable?
In this example, '못쓰게' shows that the pen became unusable due to lack of ink.