that cannot be seen; that is not seen 看不见的;无形的 not previously seen 前所未见的;未被发现的
Idioms
sight unseen
if you buy something sight unseen, you do not have an opportunity to see it before you buy it 在未见过的情况下;事先未经检查 I bought it, sight unseen. 我没见到东西就把它买下了。