Most passed typically refers to something that is frequently or commonly achieved or accomplished. Antonyms for this expression could include least passed, seldom passed, rarely passed, or infrequently passed. These antonyms suggest that the particular goal, test, or achievement in question is challenging, uncommon or difficult to attain. While most passed implies a high level of success or accomplishment, these antonyms convey the opposite meaning, indicating that the outcome in question is not achieved as easily or frequently. By using these antonyms, individuals can describe different levels of achievement or difficulty when discussing the success of a task or goal.