The word "creepy bro" is a colloquial term used to describe someone who exhibits unsettling behavior. However, there are several synonyms that can be used to convey the same meaning, including "weirdo," "freak," "strange dude," "pervert," "stalker," "creeper," and "oddball." Each of these words describes someone who makes others feel uncomfortable or uneasy, often due to inappropriate actions or comments. It is important to note that while these words are synonyms for "creepy bro," they should be used with caution and only in appropriate contexts to avoid offending or insulting others.