1553. Bale, Vocacyon, 48 b. A perpetuall and vnplacable enemye.
1594. ? Greene, Selimus, Prologue, 10. You shall behold him character in blood The image of an unplacable King.
a. 1619. Fotherby, Atheom., I. xiii. § 3 (1622), 141. An vnplacable hatred.
1676. Bp. N. French, Vnkinde Desertor, Pref. A hard-harted man, and our vnplacable enemy.