The snag about an endowment mortgage is its inflexibility.
人寿保险抵押的问题在于其缺乏灵活性。
2ADJ-GRADED 顽固的;僵化的 If you say that someone is inflexible, you are criticizing them because they refuse to change their mind or alter their way of doing things. 顽固的;僵化的 [disapproval]
His opponents viewed him as stubborn, dogmatic, and inflexible.