IPA: /ˈbuːtləs/
KK: /ˈbutləs/
Something that is without use or benefit; it does not help or serve a purpose.
His efforts to change the situation were bootless, as no one was willing to listen.
Bootless → It is formed from "boot" (from Old English *bōt*, meaning remedy or help) and "-less" (meaning without). The word "bootless" means without remedy or help, often implying futility or ineffectiveness.
Think of being 'without' ('-less') a 'remedy' or 'help' ('boot') — that's why bootless means futile or ineffective.