Antonyms for the word "big-timer" can include "small fry," "loser," or "nobodies." These words all describe individuals who lack the power, influence, or success associated with being a "big-timer." While "big-timer" implies someone who is important or significant, its antonyms indicate the opposite. "Small fry" suggests someone who is insignificant or unimportant, while "loser" implies a person who has failed or experienced a significant setback. "Nobodies" suggests anonymity and a lack of recognition or status. These antonyms can be useful in contrasting individuals who have achieved success and those who have not.