IPA: //ʌnˈseɪfɪst//
KK: /ʌnˈseɪfɪst/
The most dangerous or risky; having the highest level of danger.
This area is considered the unsafest place in the city after dark.
Comparative: more unsafe
Superlative: unsafest
Unsafest → It is formed from "un-" (meaning not) and "safe" (from Old French *sauf*, meaning free from danger) and the superlative suffix "-est" (indicating the highest degree). The word "unsafest" means the most not safe or the least secure.
Think of 'not' ('un-') being added to 'safe' to show that something is the most dangerous or least secure.
No commonly confused words.