Ephemeral
ephemeral ɪˈfɛm(ə)r(ə)l,-ˈfiːm-/Submit adjective 1. lasting for a very short time. <> Summary: They knew they were a time bomb, but they pulled the key anyway. Dan and Phil knew more than anyone that death wasn't kind to anyone, and though they know it's a bad idea, they can't help but fall in love.