Antonyms are words that have opposite meanings to each other. When it comes to the term "herky jerky," which refers to movements that are awkward and abrupt, some possible antonyms include "smooth," "graceful," "fluid," "seamless," "effortless," and "unhurried." These words suggest deftness, elegance, and ease of movement, which are qualities that are completely opposite to the jarring and awkward motions that "herky jerky" describes. Using antonyms in writing can help to create a vivid contrast between two ideas, making the text more engaging and impactful for the reader.