unjammableadj.
/(ˌ)ʌnˈdʒaməbl/, U.S. /ˌənˈdʒæməb(ə)l/ 1. That cannot be made inoperative or non-functional by a component part becoming wedged or immobilized.
ΚΠ
1911 Electric Railway Jrnl. 10 Oct. 711/2 Car windows and unjammable sash holders.
1979 Flug Revue Apr. 4/3 For its primary mission of air defence, the TKF-90 will have infrared and radar missiles and an unjammable gun.
1999 D. Koontz False Memory xxv. 154 With its single-action let-off..and virtually unjammable seven-round magazine, this was an ideal close-up, personal-defense piece.
2.
a. Of a transmission, esp. a radio signal: that cannot be rendered unintelligible or useless by means of (deliberate) interference. Also figurative.
ΚΠ
1942 Sci. News Let. 19 Dec. 396/3 ‘Unjammable’ secret radio communication, using phase modulation instead of amplitude or frequency modulation.
1959 Economist 11 Apr. 140/2 The [Soviet] government fears that this information has already become unjammable.
1963 Daily Tel. 4 Mar. 1/7 Typhon is designed to knock down aircraft and winged missiles by homing on them with its ‘unjammable’ radar.
2012 T. Wolfe Back to Blood 12 $940,000 the federal government had allotted an anti-Castro organization in Miami in order to initiate unjammable television broadcasts to Cuba.
b. Of a device, etc.: that cannot be prevented from working properly by means of (deliberate) interference with radio signals or other transmissions.
ΚΠ
1956 Corpus Christi (Texas) Times 16 July 2- b/3 A radar network hooked up to an unjammable communications system.
1975 Financial Times 27 Jan. 28/3 Unjammable and proof against the effects of traffic vibration.., the ultrasonic detector could be linked in to most general protection systems.
2004 D. J. Morris Storm on Horizon (2005) vi. 75 A small green microphone-speaker set, which because it was wire-connected, was completely unjammable.
This entry has been updated (OED Third Edition, June 2018; most recently modified version published online March 2022).
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adj.1911