Not having received training or experience.

अप्रशिक्षित

English Usage: The untrained dog ran away during the walk.

Hindi Usage: अप्रशिक्षित कुत्ता चलने के दौरान भाग गया।

Someone who has not undergone training.

अप्रशिक्षित व्यक्ति

English Usage: The untrained staff struggled to complete the task.

Hindi Usage: अप्रशिक्षित कर्मचारियों ने कार्य पूरा करने में संघर्ष किया।

To reverse training or to cause to be untrained.

अप्रशिक्षित करना

English Usage: The coach had to untrain his old methods.

Hindi Usage: कोच को अपनी पुरानी विधियों को अप्रशिक्षित करना पड़ा।