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