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. It was often said that he had the best untrained mind in politics
Someone who is untrained has not been taught the skills that they need for a particular job, activity, or situation. It is a nonsense to say we have untrained staff dealing with emergencies Our Intelligence Service was untrained, cumbersome, and almost wholly ineffectual
not disciplined or conditioned or made adept by training; "an untrained voice"; "untrained troops"; "young minds untrained in the habit of concentration"