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.
Pointless, foolish, lacking intellectual content or value.
Lacking brightness or clearness, as a colour.
Extremely stupid.
To make stupid.
To represent as stupid.
To reduce the intellectual demands of.