pickproof

pick·proof

 (pĭk′pro͞of′)
adj.
Designed to prevent picking: a pickproof lock.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pickproof

(ˈpɪkˌpruːf)
adj
(Metallurgy) (of a lock) unable to be picked
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
This requires creation of glory, rewards, "hoopla" in the media, and all the things that encourage people to pursue any field of activity--Jacob Rabinow, holder of more than 200 patents including the magnetic particle clutch, the automatic clock regulator and, most recently, a pickproof lock; writing in Chemtech, March 1980, p.
Made by ABLOY Security, Inc., of Irving, Texas, the locking system offers resistance to surreptitious entry, resists impressioning, and is virtually pickproof. It offers a high level of key control with its restricted, patented key profiles and key security levels.
The electronic padlock system consists of the pickproof electronic cylinder, a CyberKey that cannot be duplicated, and CyberAudit access control software.