The phrase "were done for" is often used to express a sense of desperation, hopeless, or defeat. To convey a similar sentiment, the following synonyms could be used - "finished," "kaput," "ruined," "no hope," "beyond repair,""a lost cause," "irretrievable," "diminished," "exhausted," "spent," "wrecked," "vanquished," "destroyed," "obliterated," "defeated," "bested," "overwhelmed," "conquered," or "trounced." These words can be used to effectively convey a sense of despair and hopelessness in situations where all possible options have been exhausted, and there seems to be no chance of recovery or survival.