The phrase "around-the-clock" implies continuous or nonstop activity. In its place, one could use the term "24/7" which is an abbreviation for "24 hours a day, 7 days a week". An alternative phrase would be "round-the-clock" which has a similar meaning and is used more commonly in British English. "Non-stop" and "continuous" are also synonyms that work well with the term. Other options include "unceasing", "constant", and "perpetual". All of these words convey an uninterrupted element that would accurately describe a situation that is consistently ongoing, without cessation. When substituting the phrase "around-the-clock" with any of these synonyms, it provides alternatives for repetition and variation in writing.