un ‧ trained /ˌʌnˈtreɪnd◂/ BrE AmE adjective
[ Word Family: noun : ↑ trainee , ↑ trainer , ↑ training , ↑ retraining ; verb : ↑ train , ↑ retrain ; adjective : trained ≠ ↑ untrained ]
1 . not trained to do something:
untrained staff
2 . to the untrained eye/ear when someone who does not have special knowledge of a subject looks at something or listens to it:
To the untrained eye, the two flowers look remarkably similar.