Answer: instone

AnswerCrossword Clue
INSTONEUnchangeable
INSTONEHow rules might be written
INSTONENot debatable
INSTONENonnegotiable, as a plan
INSTONEPermanently
INSTONEHow some things are written
INSTONESet .. (final)
INSTONEHow some things are set
INSTONESet up, as software
INSTONEHow some things are carved
INSTONEHow some things are chiseled
INSTONESet ... (definite)