Snooziest is a word that refers to something that is excessively sleepy or dull. Its antonyms, on the other hand, describe activities or things that are lively, active, or engaging. Some antonyms for snooziest include energetic, vibrant, stimulating, exciting, and exhilarating. These words suggest a sense of vigor and enthusiasm that are the opposite of the lethargic and uninteresting connotations associated with snooziest. Synonyms such as lively, dynamic, and thrilling might also be appropriate depending on the context. Using such antonyms in writing or conversation can help to create a lively and engaging tone and avoid any suggestion of boredom or disinterest.