Step lively, a term used to encourage someone to move quickly or hurry up, has a variety of antonyms that describe a different pace. Some antonyms include languid, lethargic, sluggish, slow, and plodding. Languid refers to a relaxing pace, while lethargic and sluggish imply a lack of energy or motivation. Slow and plodding are more straightforward and emphasize a steady, deliberate pace. Other antonyms could include amble, saunter, stroll, dawdle, or meander, which describe a leisurely or aimless pace. Regardless of the antonym used, the pace indicated is the opposite of the quick and efficient movement suggested by "step lively.