unprocurable
adj. 不可实现的；不可获得的
同义词
参考例子
1.Experiment must be designed to yield results for the good of society, unprocurable by other means of study.
只有用其它的研究方法不能办到，才可以进行人体实验。而人体实验的结果一定是有利于人类社会。
英文解释
adj.
1.not capable of being obtained