Merriam-Webster Collegiate Dictionary - crazy

 I. adjective  (crazier; -est)  Date: 1566  1.  a. full of cracks or flaws ; unsound they were very ~, wretched cabins — Charles Dickens  b. crooked, askew  2.  a. mad, insane yelling like a ~ man  b.  (1) impractical a ~ plan  (2) erratic ~ drivers  c. being out of the ordinary ; unusual a taste for ~ hats  3.  a. distracted with desire or excitement a thrill-~ mob  b. absurdly fond ; infatuated he's ~ about the girl  c. passionately preoccupied ; obsessed ~ about boats  • crazily adverb  • craziness noun  II. noun  (plural crazies)  Date: 1867 one who is or acts ~; especially such a one associated with a radical or extremist political cause  III. adverb  Date: 1887 extremely, wildly ~ good