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.
Clumsy and stupid; resembling a lubber (an inexperienced person).
Lacking in seamanship; of or suitable to a landlubber who is new to being at sea and unfamiliar with the ways of a sailor.
In the manner of a landlubber.