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...對于外行人來說，西部搖擺是爵士樂、節奏布魯斯、搖滾樂和鄉村音樂的融合。Its appeal may not be immediately obvious to the uninitiated.不熟悉的人很難一下子體會到它的魅力。
英英詞典釋義
Adjective
1. not initiated; deficient in relevant experience;
"it seemed a bizarre ceremony to uninitiated western eyes"