tenable
adjective formal uk/ˈten.ə.bəl/ us/ˈten.ə.bəl/
（观点）站得住脚的；（职位）可保持一段时间的
(of an opinion or position) able to be defended successfully or held for a particular period of time
His theory is no longer tenable in the light of the recent discoveries. 根据最新的发现，他的理论已经站不住脚了。
The fellowship is tenable for (= lasts for) three years. 这个研究员职位任期为3年。