1. Firm, unwavering rules or fundamental beliefs that are strictly adhered to and enforced with little flexibility
The company operates under strict principles of ethical conduct.
A empresa opera sob princípios rigorosos de conduta ética.
2. Fundamental rules or standards that are inflexible and allow no exceptions
She raised her children according to strict principles of discipline.
Ela criou seus filhos de acordo com princípios rigorosos de disciplina.