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.
ridiculous - Deserving or inviting mockery or laughter due to being absurd or unreasonable; outrageously unreasonable or exaggerated in a way that provokes disbelief.
They laughed when he made the ridiculous claim that he could lift a car by himself, but then lo and behold they watched him actually do it.
