untrained

untrained employees未经培训的员工

an untrained singing voice未经训练的歌喉

To the untrained eye, it looks like the magician really is sawing the woman in half.外行人看来，魔术师好像真的在把这名女子锯成两半。

His untrained ear could not pick out the wrong notes.由于没经过练耳，他分辨不出错误的音符。