The antonyms for the word "turned advantage" can be devastating, disadvantageous, unsuccessful, losing, or unfavorable. When a situation or circumstance turns against someone, their advantage can easily become a disadvantage. For instance, if a company's stocks are performing well, but then the economy takes a downturn, the company may experience a significant loss in profits. Similarly, an athlete who is performing well in the game may face injuries that make them lose their advantage, giving their opponent an upper hand. It is essential to understand the antonyms of a word as it helps to expand one's vocabulary and develop better communication skills.