well-settled

Adjective

 * 1) Fully established or determined; standing on firm historical footing.
 * 2) * 2021, Edwards v. Vannoy (U.S. Supreme Court No. 19–5807), Justice Kagan dissenting:
 * Ramos didn’t just announce a new rule. It reversed a prior, well-settled one.
 * Ramos didn’t just announce a new rule. It reversed a prior, well-settled one.