IPA: //ʌnˈbuːtɪd//
KK: /ʌnˈbutɪd/
Not started up or activated, especially in reference to a computer system, or not wearing protective footwear.
The computer remained unbooted until the technician arrived to fix it.
Unbooted → It is formed from "un-" (meaning not) and "boot" (from Old English *bōt*, meaning remedy or help). The word "unbooted" means not having been provided with a remedy or help, often used in the context of a system that has not been started or initialized.
Think of 'not' ('un-') having a 'remedy' or 'help' ('boot') — that's why unbooted means not having been started or initialized.