Since some facsimiles were made long ago, they look old to an untrained eye.

FORBES: Connect

Teaching reading and writing is a complex undertaking, especially when the learner is an adult, and the educator is an untrained volunteer.

UNESCO: Kha Ri Gude (Let Us Learn) Adult Literacy Programme (KGALP)

"I don't think this behavior was atypical" of an untrained hacker.

CNN: Graphic

His text-to-speech software chirps at him in an almost indecipherable way, moving so quickly that an untrained ear can only catch parts of what the computer is saying.

NPR: For Blind Lawmaker, Biography Reflects In Policy

To the untrained eye, the painting is merely an array of abstract lines and circles.

ECONOMIST: Aboriginal art

Raw and untrained, her voice cuts through the clattering synths with an unexpected emotional resonance.

BBC: Sound of 2013: Chvrches

Even the untrained art critics, that were the prison staff, all saw an early talent and viewed his works at the San Quentin Prison Hobby Gift Store.

FORBES: The Mastery of The Escape Artist