Where does “unhijackable” come from?

unhijackable (English) comes from English hijackable, from English hijack, from English jacker, from English jacklight, from English Jack, from Middle English jakke, from Anglo-Norman jacke, from Middle French jaque — heel of the foot; heel.

unhijackable (English): That cannot be hijacked

Definitions

  1. That cannot be hijacked

Ancestry of “unhijackable”, step by step

unhijackable traces back through two separate lines of ancestry.

via English hijackable

StepLanguageWordMeaning
1EnglishhijackableCapable of being hijacked
2EnglishhijackTo forcibly seize control of some vehicle in order to rob it or to reach a destination (especially an airplane, truck or a boat)
3EnglishjackerOne who hunts at night using a jacklight
4EnglishjacklightA spotlight or lamp mounted on a car; To shine a...
5EnglishJackA placeholder or conventional name for any man,...
6Middle EnglishjakkeA padded coat, especially as light armour
7Anglo-Normanjacke
8Middle Frenchjaque
9Middle Frenchjacques
10Frenchjacquesplural of jacque; a stupid person; a jemmy or...
11LatinIacobusJacob; James; Saint James
12Ancient GreekἸάκωβος
13Ancient GreekἸακώβJacob
14HebrewיַעֲקֹבJacob
15Hebrewעָקֵבheel of the foot; heel

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Hebrew עָקֵבEvery word from Hebrew יַעֲקֹבEvery word from Ancient Greek Ἰακώβ