When it comes to being particular or selective about something, people often use the phrase "be fussy about." However, there are several synonyms that can convey the same meaning and add variety to your vocabulary. You can use expressions like "be choosy about," "be meticulous about," "be fastidious about," or "be picky about" to describe someone who is very particular about something. You can also use "be nitpicky about," "be finicky about," or "be critical about" to express a more negative connotation. By using a variety of synonyms, you can better articulate your thoughts and ideas and avoid repeating the same words over and over again.