[kill.ing] n (15c) 1: the act of one that kills
2: kill 2a
3: a sudden notable gain or profit
[2]killing adj (15c) 1: that kills or relates to killing
2: highly amusing
3: extremely difficult to deal with "the suspense is ~"; also: calling for great strength, stamina, or endurance "a ~ schedule" -- kill.ing.ly adv