professional

competent efficient experienced licensed qualified skillful

ace adept crackerjack expert sharp slick there

able acknowledged big-league finished knowing one's stuff known learned on the ball polished practiced proficient up to speed well-qualified

green ignorant incapable incompetent inefficient inexperienced unable unskilled untalented

clumsy inept stupid unintelligent

amateur rookie unprofessional untrained

artist expert pro specialist

adept artiste authority brain egghead hotshot powerhouse pundit shark star superstar virtuoso whiz wizard

old hand old pro old war-horse phenom proficient whiz kid

amateur rookie

apprentice greenhorn