"Sound principles" refers to a set of beliefs, rules, or ideas that are reliable, effective, and trustworthy. It means having a strong foundation or basis for making good decisions or judgments. Full definition
Control over and responsibility for schools must be grounded in sound principles of participatory democracy. (fairtest.org)
As financial markets become increasingly volatile, the need for investment solutions based on sound principles becomes ever more important. (bespokepremium.com)
To be sure, not all property investment is made with sound principles in mind. (realtormag.realtor.org)