1lu·na·tic 
/ˈlu:nəˌtɪk/ noun
plural lu·na·tics /ˈlu:nəˌtɪk/ noun [count] informal 1 old-fashioned + sometimes offensive : an insane person
▪ a murderous lunatic ▪ He was raving like a lunatic. 2 informal : a person who behaves in a very foolish way
▪ I almost got into an accident with some lunatic on the highway. ▪ My boss is a complete lunatic. ▪ He was a lunatic out on the ski slopes. [=he was an extremely daring, reckless, or aggressive skier]
▪ a murderous lunatic ▪ He was raving like a lunatic.
▪ I almost got into an accident with some lunatic on the highway. ▪ My boss is a complete lunatic. ▪ He was a lunatic out on the ski slopes. [=he was an extremely daring, reckless, or aggressive skier]
