The term "more goose-bumpy" implies a sensation of chills or shivers down one's spine. Its antonyms would be words that describe a lack of such a sensation. For instance, words like calm, steady, relaxed, or composed do not convey the same sense of excitement or fear that "more goose-bumpy" does. Other antonyms for "more goose-bumpy" could be terms like unstimulated, unexciting, dull, or uneventful. In other words, antonyms for "more goose-bumpy" describe experiences that are less invigorating, less thrilling, or less intense. Ultimately, the choice of antonym depends on the context and the writer's intention.