Not precisely 不见得，不一定，不准确

【例句】
We may have to agree that the noble Lord is not precisely a nonpareil as a departmental minister.
我们也许只能一致认定；这位高贵的勋爵作为一位大臣不一定算得全善全美。

Not precisely determined or established; not fixed or known in advance.
没有准确的确定或者制定；预先不固定或者不知道。