Brownes sign, also known as the "thumb sign," is a medical term commonly used to describe a positive finding in patients with acute epiglottitis. However, when it comes to antonyms, there is no single word that can directly oppose Brownes sign. Instead, one can use words like "negative," "absent," or "lack of" when describing the absence of the thumb sign. Additionally, antonyms for epiglottitis, the condition associated with Brownes sign, could include words like health, wellness, or normalcy. While antonyms for Brownes sign may not be as straightforward as other terms, understanding the opposite of the thumb sign can be crucial to aid in the diagnosis and treatment of a patient.