Use 'imperil' when the risk involves serious harm or loss, not just minor trouble. Ignoring the town's evacuation warnings could imperil residents' lives.
Pro Tip 2/3
Not Just Physical
'Imperil' can refer to other kinds of danger, like damaging reputation or financial health. The scandal could imperil the company's reputation.
Pro Tip 3/3
Strong Emotion
Using 'imperil' suggests a strong emotional response, like worry or anxiety about the risk. The new policy imperils our privacy and has many people concerned.