a. 未看见的, 不在视野中的, 被遮住视线的

[ adj ]
unable to see
<adj.all>
a person is blind to the extent that he must devise alternative techniques to do efficiently those things he would do with sight if he had normal vision

Unsighted \Un*sight"ed\, a.
1. Not sighted, or seen. --Suckling.

2. (Gun.) Not aimed by means of a sight; also, not furnished
with a sight, or with a properly adjusted sight; as, to
shoot and unsighted rife or cannon.