The phrase "in fast lane" refers to being in a state of rapid movement or progress. Some antonyms for this phrase include "slow lane," which implies a slower pace, and "standstill," which suggests complete stagnation. Other antonyms include "leisurely," which describes a relaxed and unhurried pace, and "stagnant," which implies a lack of movement or progress. Additionally, "sluggish" and "tardy" are antonyms that describe a delay or slowness in movement. It's important to remember that while being in the fast lane can lead to success and progress, taking a slower pace or pausing to reflect and rest can also have its benefits.