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Antonyms for Professional (opposite meaning)

WordNet sense 1 (does not play for pay):
amateur

WordNet sense 2 (not characteristic of or befitting a profession or one engaged in a profession):
unprofessional

WordNet sense 3 (not professional; not engaged in a profession or engaging in as a profession or for gain):
nonprofessional


From the ODE community, based on WordNetadd/edit