a. (UN-1 7 b.)
1612. Beaum. & Fl., Coxcomb, II. ii. Not a door open now, but double barr’d;… and their locks unpickable.
1862. Catal. Internat. Exhib., II. No. 5993. The so-called ‘unpickable’ locks.
1869. Mrs. Whitney, We Girls, xii. She put her principles into her unpickable pocket.
