ADJ
(嗓子)未受專門訓(xùn)練的；(心智)未受正規(guī)教育的
If you describe a voice or a mind, for example, as untrained, you mean that it has not been developed through formal education or training.
例句
It was often said that he had the best untrained mind in politics.
人們常說，他雖未受過專門訓(xùn)練卻極有政治頭腦。