expendable - Not essential, able to be used up or sacrificed without significant loss, easily replaced or not necessary for long-term use.
The workers didn't feel any sense of job security, and they felt expendable, because they were fired whenever the demand for the factory work slowed down.
farce - A deceptive action that someone tries to fool others into believing that he takes it seriously
Everyone in town knew that a bridge at the busy intersection was needed, but they felt that all the Mayor's activity about the subject was just a farce because he didn't really take the problem seriously.