IPA: /ˈtʃeɪstɪst/
KK: /ˈtʃeɪstɪst/
The highest degree of being pure, modest, or innocent, especially in relation to sexual conduct.
She was known for her chastest behavior, always acting with dignity and respect.
Comparative: chaster
Superlative: chastest
Chastest → It is formed from "chaste" (from Latin *castus*, meaning pure or unblemished) and the superlative suffix "-est" (meaning most). The word "chastest" means most pure or most virtuous.
Think of 'pure' ('castus') to remember that 'chastest' means the most pure or virtuous.