Unchaste is a word that describes someone who is sexually promiscuous or impure. The antonyms for this word include chaste, pure, virtuous, modest, celibate, virgin, and innocent. These words describe someone who abstains from sexual relations or who maintains a high level of purity and morality. Chaste refers to someone who avoids sexual immorality and keeps themselves pure, while pure describes someone who is free from any kind of contamination or impurity. Virtuous denotes high moral standards and behavior, while modest describes someone with humility and respects themselves and others. Celibate means abstaining from sex, while virgin and innocent describe someone who has not had any sexual experiences.