1540s, "condition of being a lunatic," formed in English from lunatic + -cy. Originally in reference to intermittent periods of insanity, such as were believed to be triggered by the moon's cycle. The Old English equivalent was monaðseocnes "month-sickness."
权威例句
1. "That's lunacy," he blustered.
“那真是疯了,”他吼道。
2. It's sheer lunacy driving in such weather.
天气这样糟糕还开车,真是疯了。
3. It remains lunacy to produce yet more coal to add to power stations' stockpiles.
煤越产越多,而发电站的煤堆越来越高,这始终是愚蠢的行为。
4. O'Brien had tortured him to the edge of lunacy.
奥勃良快把他折磨到了神经错乱的地步.
5. This is sheer cock - eyed lunacy, absolute lunacy.