untrained

US /ʌnˈtreɪnd/
UK /ʌnˈtreɪnd/
"untrained" picture
1.

未經訓練的, 不熟練的

not having been taught or developed a particular skill or type of behavior

:
The new recruits were completely untrained.
新兵們完全未經訓練
She has an untrained eye for art.
她對藝術的眼光未經訓練