1 colloq. (of a person, an action, etc.) insane or mad; foolish.
2 colloq. (usu. foll. by about) extremely enthusiastic.
3 sl. a exciting, unrestrained. b excellent.
4 (attrib.) (of paving, a quilt, etc.) made of irregular pieces fitted together.
5 archaic (of a ship, building, etc.) unsound, shaky.
Phrases and idioms:
crazy bone US the funny bone. like crazy colloq. = like mad (see MAD).
Derivatives:
crazily adv. craziness n.
Useful english dictionary. 2012.