adj.
Pronunciation: ˌ in-k ə - ' myü-t ə -b ə l
Function: adjective
Etymology: Middle English, from Latin incommutabilis, from in- + commutabilis commutable
Date: 15th century
: not commutable: as a : not interchangeable b : UNCHANGEABLE
– in · com · mut · ably \ -bl ē \ adverb