IPA: /ˈsuːpərseɪf/
KK: /ˈsupərˌseɪf/
Extremely secure or protected, providing a high level of safety.
The new security system makes the building supersafe from intruders.
Supersafe → It is formed from "super-" (meaning above or beyond) and "safe" (from Old French *sauf*, meaning free from danger). The word "supersafe" means being beyond safe or extremely secure.
Think of being 'above' ('super-') being 'free from danger' ('safe') — that's why supersafe means extremely secure.