1. 未讲出来的；不说的
    If something is left unsaid or goes unsaid in a particular situation, it is not said, although you might have expected it to be said.

unsaid的近义词

    e.g. Some things, Donald, are better left unsaid...
           唐纳德，有些事还是不说为好。
    e.g. What she and her characters leave unsaid is often more important than what they actually put into words...
           她和她作品中的角色避而不谈的内容往往比明言的更为重要。

1. not made explicit

    e.g. the unexpressed terms of the agreement
           things left unsaid
           some kind of unspoken agreement
           his action is clear but his reason remains unstated

    Synonym: unexpressedunstatedunutteredunverbalizedunverbalisedunvoicedunspoken