in-commūtābĭlis — Lewis & Short
in-commūtābĭlis, e, adj.,
I unchangeable, immutable (rare but class.):
omnia verbi principia incommutabilia viderentur (opp. commutabilia),Varr. L. L. 9, § 99 Müll.: status rei publicae, * Cic. Rep. 2, 33, 57:
bonum,Aug. Retract. 1, 9.— Adv.: in-commūtābĭlĭter, unchangeably, immutably, Aug. Ep. 3, 3; id. Trin. 7, 1.