IPA: /ˈseɪfɪst/
KK: /ˈseɪfɪst/
The most secure or protected from danger or harm.
Wearing a seatbelt is the safest way to travel in a car.
Comparative: safer
Superlative: safest
Safest → It is formed from "safe" (from Old French *sauf*, meaning free from danger) and the suffix "-est" (used to form the superlative degree). The word "safest" means the most free from danger or harm.
Think of being 'free from danger' ('safe') and remember that 'safest' means the most secure or protected.