adj. Lacking training, not having been instructed in something.
the GNU version of the Collaborative International Dictionary of English
adj. Not trained.
adj. Not trainable; indocile.
The Century Dictionary and Cyclopedia
Not trained; not disciplined; uneducated; uninstructed.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. not disciplined or conditioned or made adept by training
Word Usage
"In research from France, citrulline was shown to help prevent post-exercise fatigue and muscle soreness in untrained athletes, when taken after exercise."