" unworkable "

1: not capable of being put to use or account;

  * e.g., " ... the company decided that the proposed reorganization of its operations was unworkable due to high costs "

•  Synonyms : 

•  impracticable,

•  impractical,

•  inoperable,

•  nonpractical,

•  unserviceable,

•  unusable,

•  useless

•  Antonyms : 

•  applicable,

•  feasible,

•  functional,

•  operable,

•  operational,

•  practicable,

•  practical,

•  serviceable,

•  ultrapractical,

•  usable,

•  useful,

•  utilizable,

•  workable