untransˈmutable,a. (un-1 7 b, 5 b.) 1611Florio, Intrasmutabile, vntransmutable.1682H. More Annot. Glanvill's Lux O. 52 Spirits specifically different, are untransmutable one into another.a1776Hume Ess. (1777) II. 351 Each character..appears to me, in practice, pretty durable and untransmutable.