Incom*mut"a*bly

from The Collaborative International Dictionary of English v.0.48

Incommutable \In`com*mut"a*ble\, a. [L. incommutabilis: cf. F.
   incommutable. See {In-} not, and {Commutable}.]
   Not commutable; not capable of being exchanged with, or
   substituted for, another. --Cudworth. --
   {In`com*mut"a*ble*ness}, n. -- {In`com*mut"a*bly}, adv.
   Incompact