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.
Trauma - A deeply distressing or disturbing experience, especially one with lasting emotional impact; a psychological or emotional wound, often resulting from an intense or life-threatening event.

Childhood trauma can have long-lasting effects on a person’s mental health