The antonyms for the word "staid in line" would include terms such as "rebellious," "disobedient," and "spontaneous." These are all qualities that go against the idea of being "staid in line" and suggest a willingness to defy authority or convention in favor of personal freedom or expression. Other potential antonyms might include words like "adventurous," "unpredictable," and "impulsive," as all of these suggest a willingness to deviate from the norm and pursue one's own desires or interests. Ultimately, the choice of antonym will depend on the context and tone of the situation in which the phrase is being used.