Answer: instone

AnswerCrossword Clue
INSTONE

Unchangeable

INSTONE

How rules might be written

INSTONE

Not debatable

INSTONE
Nonnegotiable, as a plan
INSTONE
Permanently
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)