IPA: //ʌnˈtʃeɪst//
KK: /ʌnˈtʃeɪst/
Not pure or modest in behavior or appearance; lacking in sexual restraint.
The character in the novel was often described as unchaste due to her provocative actions.
Unchaste → It is formed from "un-" (meaning not) and "castus" (from Latin, meaning pure or chaste). The word "unchaste" means not pure or lacking in chastity.
Think of 'not' ('un-') being added to 'pure' ('castus') — that's why unchaste means lacking purity.