imperil /im-perˈil/ (formal)

To endanger

imperˈilment noun

• deathlier
• deathliest
• deathlike
• deathliness
• deathlinesses
• deathly
• death-marked
• death mask
• death masks
• deathmatch
• deathmatches
• death metal
• death on
• death penalties
• death penalty
• death-practised
• death rate
• death rates
• death rattle
• death rattles
• death ray
• death rays
• death roll
• death rolls
• death row