파손되거나 상태가 좋지 않아 사용할 수 없는
Not fit or suitable to be used, often because of being broken, damaged, or in poor condition.
예문:
"The storm left the coastal road completely unusable due to debris."
"The laboratory equipment was so old that it had become unusable for modern experiments."
"A corrupted file made the entire database unusable for the research team."