untrained (adj.)

• amateurish
• ignorant
• inexperienced
• rusty
• semiskilled
• unaccustomed
• unendowed
• unfinished
• unhardened
• uninitiated
• unpolished
• unpracticed
• unprepared
• unprofessional
• unschooled
• unseasoned
• unskilled
• untalented
• untaught
• untutored
• unused
• unwonted
• weaned