Meaning of untrained

1. The untrained dog jumped on the furniture without hesitation.
2. The untrained employee struggled to keep up with the fast-paced environment.
3. The untrained driver had difficulty maneuvering the large truck.
4. The untrained waiter spilled drinks on multiple customers during his first day on the job.
5. The untrained singer struggled to hit the high notes during the performance.
6. The untrained athlete was no match for his more experienced opponents.
7. The untrained chef burned the dish because he didn't know how to control the heat.
8. The untrained technician made a mistake that caused the entire system to crash.
9. The untrained dancer stumbled over her own feet during the routine.
10. The untrained artist lacked the skills to create a realistic portrait.