1. not belonging to or characteristic of a profession; not requiring or involving specialized training or credentials
2. lacking the skill, competence, or standards expected of a professional
Usage: often used critically

1. a person who is not a member of a profession or who lacks professional training or credentials

Examples

• She took a nonprofessional approach to the project, relying on common sense rather than formal methods.
• The team included both professional athletes and nonprofessionals who competed for fun.
• His nonprofessional conduct during the meeting disappointed the board members.
• Many nonprofessionals have learned to code through online tutorials.
• The organization welcomes nonprofessional volunteers to help with community events.
• A nonprofessional photographer can still take beautiful pictures with a good camera.
• The report was criticized for its nonprofessional presentation and lack of detail.