1414. Brampton, Penit. Ps. (Percy Soc.), 38. Thou art unmutable be kynd! There is no changyng foundyn in the!
1429. Pol. Poems (Rolls), II. 145. Prince excelent, be … liberal of courage, unmutable.
1491. Caxton, Vitas Patr. (W. de W., 1495), II. 272/2. We have one unmutable rule in fastyng.
1548. Udall, Erasm. Par. Luke, 165 b. Leat that bee dooen, whyche thy wyll beyng vnmutable hath determined.
1550. Coverdale, Spir. Perle, viii. (1588), 93. His vnmutable truthe, wherby he doth faithfully performe all his promises.
