The antonyms for the word "wast indecorous" are several, and they include words that are more appropriate and in line with social norms. The first antonym for this word is "proper," which means conforming to accepted standards of behavior or manners. Another antonym is "decorous," which means characterized by dignified propriety in conduct, manners, or appearance. The opposite of wast indecorous can also be "polite" meaning showing good manners towards others, or "cultured" meaning having or showing good taste, refinement, or education. Hence, using antonyms of wast indecorous in speech or writing can help to avoid offending or disrespecting others, and promote a culture of civility and respect.