Unhallow is a word often used to describe something that is not sacred or holy. However, there are several synonyms that can be used instead of this word to add more variety to your vocabulary. Some of these words include profane, impious, sacrilegious, desecrate, and blaspheme. Profane refers to something that is disrespectful or irreverent towards something considered sacred or holy. Impious means lacking respect or reverence for a god or religion. Sacrilegious refers to an act that violates or is considered disrespectful to a holy place, object, or person. Desecrate means to treat something holy with disrespect or irreverence. Lastly, blaspheme is used to describe the act of uttering sacrilegious or irreverent words towards something considered holy or sacred.