adj.无法得到的；难获得的

Salt is very dear, and sometimes even unobtainable. 盐很贵，有时买不到。

It would take a worldwide crisis to make food unobtainable from any source. 只有发生全球性危机，才会到处买不到食品。

The absolute allocation of these overheads is unobtainable. 这些企业管理费用的绝对分配是难以获得的。