There are several synonyms for the phrase "dead ducks," which is typically used to describe a situation that has become hopeless or ineffective. One such synonym is "lost cause," which emphasizes the idea that the situation is beyond repair. Another synonym is "hopeless endeavor," which suggests that any attempt to salvage the situation would be futile. Additionally, one might use the phrase "done deal" to describe a situation that has already reached its conclusion and cannot be changed. Other synonyms for "dead ducks" might include "pointless pursuit," "fruitless effort," or "wasted endeavor." Ultimately, these phrases all convey a sense of finality and resignation about a situation that has reached the end of its usefulness.