The phrase "more rabbity" implies that something is becoming more similar to a rabbit, but what would be its opposite? A possible antonym could be "less lagomorphic," meaning something is becoming less like a rabbit. Other antonyms could include terms that suggest un-rabbit-like qualities, such as "more predatory," "more reptilian," or "more avian." Alternatively, antonyms could emphasize qualities opposite to those suggested by "more rabbity," such as "more bovine," "more equine," or "more feline." Ultimately, the choice of antonyms for "more rabbity" will depend on the specific context and desired effect.