Untried (adjective)

1. Not tested or proven; not experienced.
2. Not attempted or done before.
3. Unfamiliar or novel.

Origin:

Middle english, from un- + tried.

Examples:

1. The untried method was selected for the difficult surgery.
2. The untried recipe was a hit at the dinner party.
3. The untried musician received a standing ovation.
4. The untried actor was cast in the lead role.
5. The untried approach was successful in solving the problem.