The phrase "gotten mad" can be replaced with various antonyms depending on the context. Instead of "mad," one could use "calm," "composed," "serene," or "tranquil" to express the opposite emotion. Alternatively, one could use phrases such as "become pleased," "feel happy," or "express joy" to change the tone of the sentence entirely. Depending on the intensity of the anger involved in the original phrase, one could also use less extreme antonyms such as "irritated," "annoyed," or "frustrated." Overall, there are many antonyms that can accurately convey the opposite sentiment of "gotten mad" depending on the intended mood and tone of the sentence.