Unchangeable; not subject or susceptible to change.
Despite the promised "new direction for America," getting the money out of politics and all of that, some facts of Washington life appear immutable and eternal.
"One hundred hours to make this the most honest and open Congress in history," House Speaker Nancy Pelosi declared at the beginning of a history-making day—which ended last night with the Democrat from California presiding over a glitzy fundraiser open to anyone with $1,000 for a ticket.
—David Montgomery and J. Freedom du Lac ”House Warming” Washington Post, January 5, 2007