Antonyms for the phrase "lost no time" could include "took their time," "delayed," "procrastinated," "hesitated," "dragged their feet," or "postponed." These words imply a sense of slowness or lack of urgency, in direct contrast to the proactive and efficient connotation of "lost no time." Other antonyms could include "wasted time," "squandered time," or "spent too much time," which suggest an excessive or inefficient use of time. Conversely, synonyms for "lost no time" might include phrases such as "acted quickly," "seized the moment," "took immediate action," or "jumped into action," highlighting the positive attributes of decisiveness and speed.