IPA: /ˈrɛdiəst/
KK: /ˈrɛdɪəst/
Most prepared or willing to do something.
She was the readiest to help with the project.
Comparative: readier
Superlative: readiest
Readiest → It is formed from "ready" (from Old English *ræde*, meaning prepared or willing) and the suffix "-est" (used to form the superlative degree). The word "readiest" means most prepared or willing.
Think of being the most 'prepared' ('ready') for something, as the '-est' indicates the highest degree.