unworkable
/ˌʌnˈwɜːkəbl/adjective
1- not able to function or be carried out successfully; impractical不起作用的, 不能实行的; 不切实际的：
an unworkable scheme.
行不通的计划。
1.1
- (of a material) not able to be worked（材料）不能加工的：
the alloy becomes brittle and almost unworkable.
合金变脆几乎不能加工。
派生词