Lacking training, not having been instructed in something.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "untrained" in a sentence
"In research from France, citrulline was shown to help prevent post-exercise fatigue and muscle soreness in untrained athletes, when taken after exercise."
"Obviously I do not support the idea of untrained and unsanctioned bailifs restraining or even distraining."
"The idea of the amendment was for a militia, defined as untrained civilians, non-military trained civilians to protect their country."