You can refer to people who have no knowledge or experience of a particular subject or activity as the uninitiated .
例句
For the uninitiated, Western Swing is a fusion of jazz, rhythm & blues, rock & roll and country music...对于外行人来说,西部摇摆是爵士乐、节奏布鲁斯、摇滚乐和乡村音乐的融合。Its appeal may not be immediately obvious to the uninitiated.不熟悉的人很难一下子体会到它的魅力。
英英词典释义
Adjective
1. not initiated; deficient in relevant experience;
"it seemed a bizarre ceremony to uninitiated western eyes"