lunacy

n [U] 1 unsoundness of mind; insanity; madness 精神错乱; 精神失常; 疯狂. 2 very foolish behaviour 极愚蠢的行为: It's sheer lunacy driving in this weather. 天气这麽坏还开车, 简直是疯了. 3 [C usu pl 通常作复数] mad or foolish act 疯狂的或愚蠢的行动.

lullaby, lumbago, lumbar, lumbar puncture, lumber, lumber-jacket, lumber-room, lumberjack, lumen, luminary, luminosity, luminous, luminously, lumme (also lummy), lump, lump sugar, lump sum, lumpish, lumpsum, lumpy, lunar, lunar calendar, lunar month, lunatic, lunatic asylum, lunch, lunch-room, lunch-time, luncheon, luncheon meat, luncheon voucher, lung, lung-power, lunge, lupin (US lupine), lurch, lure, lurid, luridly, luridness,