There are many synonyms for the term 'a good/bad loser'. A good loser can be described as 'a graceful loser' or 'a gentleman/gentlewoman in defeat'. On the other hand, a bad loser can be described as 'a sore loser', 'a bitter loser' or 'a poor sport'. A good loser takes a loss with a positive attitude, respecting their opponent's success and learning from the experience. A bad loser, however, can't handle losing and might behave inappropriately, blaming others for their failure or being overly aggressive. Ultimately, being a good loser is a mark of sportsmanship and character, demonstrating maturity and resilience in the face of adversity.