unusable

adj

1. Not usable.

   “The toilet was unusable because it was blocked.”

   “From that night until mid-morning on Sunday, November 6, the station was unusable by any electric trains and the Brighton-Eastbourne service was maintained by steam traction, assisted by two Hastings six-car diesel muliple-units—[...].”

   “This service has suffered badly from Department for Transport-inspired cuts which reduced it from hourly to two-hourly. This, coupled with regular cancellations, has rendered the train service between the area's two biggest towns almost unusable.”

noun

1. Something that is not fit for use.

   “All the fat, skin, bones and unusables from the slaughter house went to the soap factory, and got diverted to feed a company of soldiers.”