IPA: /ʌnˈwɛəriəst/
KK: /ʌnˈwɛriəst/
The most careless or not cautious; lacking awareness of potential dangers or risks.
He was the unwariest traveler, often ignoring safety warnings.
Unwariest → It is formed from the prefix "un-" (meaning not) and the root "war" (from Old English *warian*, meaning to be cautious or to take care) with the superlative suffix "-est" (indicating the highest degree). The word "unwariest" means the least cautious or the most careless.
Think of 'not cautious' ('un-') and 'to take care' ('war') — that's why unwariest means the least careful.