crazy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Mentally deranged.
• adjective Informal Departing from proportion or moderation, especially.
• adjective Possessed by enthusiasm or excitement.
• adjective Immoderately fond; infatuated.
• adjective Intensely involved or preoccupied.
• adjective Foolish or impractical; senseless.
• noun One who is or appears to be mentally deranged.
• idiom (like crazy) To an exceeding degree.

from The Century Dictionary.

• Broken; impaired; dilapidated; weak; feeble: applied to any structure, but especially to a building or to a boat or a coach: as, a crazy old house or vessel.
• Broken, weakened, or disordered in intellect; deranged; insane; demented.
• Caused by or arising from mental derangement; marked by or manifesting insanity: as, a crazy speech; crazy actions.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Characterized by weakness or feebleness; decrepit; broken; falling to decay; shaky; unsafe.
• adjective Broken, weakened, or dissordered in intellect; shattered; demented; deranged.
• adjective colloq. Inordinately desirous; foolishly eager.
• adjective the bony projection at the end of the elbow (olecranon), behind which passes the ulnar nerve; -- so called on account of the curiously painful tingling felt, when, in a particular position, it receives a blow; -- called also funny bone.
• adjective a bedquilt made of pieces of silk or other material of various sizes, shapes, and colors, fancifully stitched together without definite plan or arrangement.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Insane; demented.
• adjective Out of control.
• adjective Overly excited or enthusiastic.
• adjective In love; experiencing romantic feelings.
• adjective informal Unexpected; surprising.
• adjective Characterized by weakness or feebleness; decrepit; broken; falling to decay; shaky; unsafe.
• adverb slang Very, extremely.
• noun An insane or eccentric person; a crackpot.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective foolish; totally unsound
• noun someone deranged and possibly dangerous
• adjective bizarre or fantastic
• adjective intensely enthusiastic about or preoccupied with
• adjective possessed by inordinate excitement
• adjective affected with madness or insanity