Similar words: loon, balloon, saloon, doubloon, pantaloon, balloonist, trial balloon, pony. Meaning: ['luːnɪ] 
n. someone deranged and possibly dangerous. adj. informal or slang terms for mentally irregular.
n. someone deranged and possibly dangerous. adj. informal or slang terms for mentally irregular. 
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31. Feedback Your Letters to the Editor More loony letters than usual this month, but never fear - we can take it.
32. You need to put a loony into this coin feeder.
33. Who knows? In a couple of years, you might find me in the loony bin !
34. Question: Obviously the main focus of the House premiere will be House in the "loony bin."
35. Well, it's possible - confused, hypnotized, loony - you know - a brain storm as they say down in New York.
36. John blinked a few times and looked at me as if I might, indeed, be loony.
37. In fact, there's a whole chemistry department full of loony chemistry professors.
38. The education aid has sparked a row in parliament, with deputy opposition leader Mark McArdle calling it "kooky, loony, loopy lefty policies."
39. You're just a fucking loony and you should be locked up.
40. When pitching he looked, in the words of the catcher, " a pretzel gone loony. "
41. Do you want to send your mum to the loony Bin ?
42. That I would never do a favor for the church of scientology founded by a loony called L. Ron Hubbard.
43. In a couple of years,(www.Sentencedict.com) you might find me in the loony bin!
44. Don't ask her! Do you want to send your mum to the loony Bin?
45. Do you want to send your mum to the loony bin.