Unchastely refers to behavior that is immoral or promiscuous. An antonym for unchastely is chastely or virtuously, which describes behavior that is pure, modest, or morally righteous. Another antonym for unchastely is modestly or decorously, which refers to behavior that is marked by propriety, reserve, or good taste. Other antonyms for unchastely include decently, respectably, and innocently, which refer to behavior that is honorable, reputable, and free from guilt or wrongdoing. The use of antonyms such as chastely, virtuously, modestly, decorously, decently, respectably, and innocently emphasizes the value that society places on morally upright behavior.