1. Teaching, guidance, or directions that fail to meet professional standards of competence, ethics, or conduct
The unprofessional instruction left students confused about the correct procedure.
A instrução não profissional deixou os alunos confusos sobre o procedimento correto.
2. Advice or training given by someone lacking proper qualifications or following improper methods
His unprofessional instruction violated the company's training protocols.
A sua orientação não profissional violou os protocolos de treinamento da empresa.