Amateurish, unprofessional, unpolished, juvenile.
Of inferior quality.
A professional sports association at the lower levels of minor league organization.
A low-ranking or inferior level among groups, professions, organizations, etc.
non-professional; amateur
A type of firecracker, used by farmers to scare rooks.
A novice.
An athlete either new to the sport or to a team or in his first year of professional competition, especially said of baseball, basketball, hockey and American football players.
An inexperienced recruit, especially in the police or armed forces.