The phrase "wasting no time" refers to acting immediately or without delay. The antonyms or opposite words for this phrase include "procrastinating," "delaying," "postponing," "slowing down," "dragging one's feet," or "wasting time." These words indicate a lack of urgency or haste in performing a task or responding to a situation, resulting in wasted opportunities or loss of productivity. However, there may be instances where taking time to reflect, deliberate, or plan may be necessary, especially in complex or critical situations. Nevertheless, in most cases, being prompt, decisive, and productive is likely to yield better outcomes in achieving one's goals.