unworkable
adjective uk/ʌnˈwɜː.kə.bəl/ us/ʌnˈwɝː.kə.bəl/
（计划）不可行的，难以实施的
An unworkable plan is not practical or cannot really be done successfully.
To be honest, I think the plan is completely unworkable. 老实说，我认为这个计划完全行不通。
Synonyms: impracticableinfeasible unfeasible
Opposites: feasiblepracticable viableworkable (HAVING EFFECT)