unusable
adj. B2 Upper Intermediate US //ənˈjuzəbəɫ// UK //ʌnjˈuːzəbəl// un·us·able
adj. not able to be used or to work properly. You use this when something is broken, damaged, or not suitable for its intended purpose.
adj. incapable of being used or functioning effectively. Often describes objects that have failed or data that cannot be processed by a system.
The old computer is completely unusable now.
After the heavy rain, the roads became so muddy that the car was unusable for travel.
The software update rendered the previous version unusable for most users, forcing the company to provide a temporary patch until the next release.
From un- + usable.