The word "un-chaste" is typically defined as lacking in moral purity or fidelity, especially in regards to sexual conduct. The antonyms of this word would be those that imply the opposite, such as "chaste," "pure," "virtuous," "faithful," and "loyal." These terms bring to mind someone who is respectable, honorable, and morally upright, and who conducts themselves with a sense of dignity and self-respect. They also suggest a person who values and upholds the sanctity of marriage or committed relationships, and who remains steadfast in their commitments despite temptations or outside pressures.