The phrase "be slavering" means to salivate or drool excessively. Some antonyms of this phrase could be "dry-mouthed," "uninterested," or "unenthusiastic." If someone is not slavering, they may be indifferent, unimpressed, or disinterested. Additionally, they may be composed or controlled, showing restraint instead of expressing a physical reaction. Other antonyms may depend on the context in which the phrase is used, but commonly they are words that indicate a lack of physical excitement or interest. Antonyms provide a helpful contrast to the word in question, expanding our vocabulary and understanding of language.