When trying to come up with synonyms for the phrase "doeth off top head," there are several possibilities that come to mind. Some potential options might include "off the cuff," "impromptu," "unrehearsed," or "spontaneous." Other alternatives could include "ad-lib," "unplanned," "on the fly," or "off the top of one's head." Whether you're trying to describe a quick, improvised response to a question or a spontaneous burst of creativity in your work, there are many ways to capture the essence of this type of thinking and expression. So next time you need to describe someone's off-the-cuff work or ideas, consider using one of these synonyms to add some flair to your language.