Douglas Harper's Etymology Dictionary
Usage examples of "well-regulated".
For who will suffer it to be said that the demons have made known the calumnious fictions of the poets concerning the immortal gods, and also the disgraceful mockeries of the theatres, and their own most ardent lust after, and most sweet pleasure in these things, whilst they have concealed from them that Plato, with the gravity of a philosopher, gave it as his opinion that all these things ought to be removed from a well-regulated republic.
The man was setting a damn poor example for Shiner—there was nothing well-regulated about sniping at motorists on the Florida Turnpike.
If, therefore, the duke found the city full of courtly delicacies, and customs unsuitable to well-regulated conduct, he left it in a much worse state.