Indecent is a word that is often used to describe something that is inappropriate or offensive. However, there are several antonyms to the word indecent. The first antonym is proper. Something that is proper is considered to be appropriate or suitable. Another antonym is modest. Modest means that someone or something is humble and not overly showy or flashy. On the other hand, formal is another antonym for indecent, describing something that is serious and dignified. Respectable is also an antonym as it denotes something or someone that is considered worthy of respect. Lastly, pure is another antonym for indecent, which signifies something that is uncontaminated or free from impurities.