unviable
adjective uk/ʌnˈvaɪ.ə.bəl/ us/ʌnˈvaɪ.ə.bəl/
不能成功的;不能实现的
not able to work as intended; not able to succeed
She concluded that the plan was unviable with the resources that were available. 她的结论是，在现有资源的情况下，该计划是不可行的。
biology specialized不能继续存活的;无法发育成活的
not able to continue to exist as, or develop into, a living being
an unviable pregnancy/foetus 不能成活的妊娠 / 胎儿