The phrase "rip roaring" denotes something thrilling, exciting, or energetic. The antonyms of rip-roaring, on the other hand, describe something that is dull, unexciting, or uneventful. Some possible antonyms for rip-roaring could be subdued, boring, unremarkable, tedious, or lackluster. These words signify an absence of liveliness or excitement, the opposite of the exuberance and dynamism associated with "rip-roaring." So, when you want to convey a sense of something being slow or unexciting, you can use one of these antonyms instead of "rip-roaring.