1) Broken-down 2) Burned-out 3) Burnt-out 4) Impossible to use 5) Inoperable 6) Nondurable 7) Nonfunctional 8) Not capable of being used 9) Not ready for service 10) Not suitable for everyday use 11) Unrepaired 12) Unusable 13) Useless 1) Inoperable 2) Nondurable 3) Nonfunctional 4) Unrepaired 5) Unusable 6) Unuseable 7) Useless 
[adj] - impossible to use 2. [adj] - not ready for service
unusable adjective not capable of being used