Well-grounded in a sentence as an adjective

In some cases well-grounded principles can be found.

Credit card payments are surely surveilled by NSA, so this actually sounds like a pretty well-grounded fear.

What gives them concrete value is the institutionalized mechanisms of enforcement, from well-grounded law, to courts, to sherifs with badges and guns.

This goes back to the times of Dijkstra, who - when visiting Russia - wrote quite unflatteringly about most stuff Soviet but the one thing he praised was that his Russian lecture attendees were uncommonly well-grounded in math and the theory of computation.

Well-grounded definitions

adjective

logically valid; "a sound argument"

See also: reasoned sound