professional

Synonyms: able ace acknowledged adept competent crackerjack efficient experienced expert finished knowing one’s stuff known learned licensed on the ball polished practiced proficient qualified sharp skillful slick there up to speed well-qualified

Antonyms: amateur rookie unprofessional unskilled untrained

Synonyms: adept artist artiste authority brain egghead expert hotshot old hand old pro old war-horse phenom powerhouse pro proficient pundit shark specialist star superstar virtuoso whiz whiz kid wizard

Antonyms: amateur apprentice greenhorn rookie