Synonym: craziness, folly, foolery, indulgence, insaneness, madness, tomfoolery. Similar words: lunar, lunatic, obstinacy, unacceptable, unaccountable, lung, flunk, lunge. Meaning: ['luːnəsɪ] 
n. 1. obsolete terms for legal insanity 2. foolish or senseless behavior.
n. 1. obsolete terms for legal insanity 2. foolish or senseless behavior. 
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1. It would be lunacy to try to climb the mountain in this weather.
2. It was sheer lunacy spending all that money.
3. It's sheer lunacy driving in this weather.
4. It's sheer lunacy driving in such weather.
5. "That's lunacy," he blustered.
6. It would be sheer lunacy to turn down a job offer like that.
7. It remains lunacy to produce yet more coal to add to power stations' stockpiles.
8. It seemed an act of sheer lunacy.
9. The signs of inherent lunacy have always been there.
10. This sort of lunacy goes on every day in the public schools and universities of our nation.
11. In drunken lunacy we had two execrable hamburgers and three orders of cold, greasy fries at the refreshment stand.
12. It would be sheer lunacy to turn down a great offer like that.
13. Lusts lashed him into lunacy.
14. I don't want anybody to misunderstand this lunacy.
15. But all this was essentially dreamy lunacy.
16. This is sheer cock - eyed lunacy, absolute lunacy.
17. O'Brien had tortured him to the edge of lunacy.
18. What you're doing here is sheer lunacy.
19. Thanks to Greek profligacy, German intransigency and Kim-Il-Jong's lunacy, we have U.S. bond buyers that are no longer rational investors.
20. Does he agree that such a policy - it is, of course, Labour policy - would be sheer lunacy?
21. In these conditions, to encourage mass protest over which they would have no control appeared sheer lunacy.
22. To administer torture while within the warp - to a talented Astropath of all people - would be plain lunacy.
23. He had trained furiously for the meet and was crushed when the doctor informed him that it would be lunacy to participate.
24. But assisting her investigations into a perfectly natural death as if it were murder was little short of lunacy.
25. And fans are in no doubt as to where bravery ends and sheer lunacy begins.
26. Wilson'disease was often misdiagnosed as various kinds of hepatitis, lunacy, falling sickness, arthritis, muscular dystrophy, nephritis, et al,(sentencedict.com) with the misdiagnosis rate of 55.5%.
27. To say that gays and lesbians are asking for special rights is the height of lunacy.